Hello,
Welcome to the community!
As mentioned in the solution below, it's not really possible to make calls on your account without your SIM. So for whatever reason, it's likely your phone made those calls. I understand that you might not have intended on making those calls. However, if the calls are on the system, they would have been made using your SIM card.
You might consider verifying your phone does not have any viruses or malware affecting it. If you have an iPhone, there have also been instances where they have made random calls without their owners knowing.
Hope this helps 😀
Cheers
Hey @Felygene !
Welcome to the Community. 
I'm sorry to learn that you had unexpected charges on your bill.
Depending on the phone number, it's definitely possible that calling a travel agency would've caused long distance fees.
If you'd like us to take a closer look at your account and your specific situation, don't hesitate to reach out to customer service!
Hello LiMaZee,
Happy New Year and Welcome to the Community!
Sorry to hear you've received unexpected additional charges on your bill. It's not really possible to make calls on your account without your SIM. So for whatever reason, it's likely your phone made those calls. I understand that you might not have intended on making those calls. However, if the calls are on the system, they would have been made using your SIM card.
I understand you use WhatsApp and other social media, however, are you aware that many apps might use cellular services if Wifi or data is insufficient? With regards to WhatsApp, while it's not mentioned on their website, it appears as though the app will automatically switch to using mobile airtime minutes if it deems the internet connection is too slow for voice calls (see here and here).
One suggestion would be to enable Airplane or Flight mode and manually enabling Wifi prior to making the call(s). Doing so should prevent the app from switching to mobile services if the Wifi internet connection is not sufficient. However, it also means that you wouldn't be able to make WhatsApp calls using a mobile data connection.
Alternatively, it's possible your phone might be making the calls without your knowledge. What phone do you have?
Is it a smartphone? The calling behaviour you note would suggest a possible virus or malware had infected your phone. Charges for unknown calls is a rather common symptom of infected devices (see here). You might consider obtaining anti-virus and anti-malware software to scan your device and remove any culprits, if present.
If this is a new occurence, have you verified that any newly installed apps are not the culprit? You might consider deleting any new apps and re-installing them one-by-one to identify a potential culprit.
You should also note that iPhones are not immune from the issue making random calls (see here, here, here, here, here, here, etc). It appears as though the issue is rather long-standing. That would be an Apple issue rather than a mobile provider issue.
As FidoVan mentioned, if you would like to discuss those charges, you would need to contact customer service.
I understand wanting to change providers out of spite, however, if the any of what was mentioned above is the culprit, it would also happen with other providers as well.
Hope this helps 😀
Cheers
Hey there @LiMaZee and welcome to the Community!
We understand that receiving an unexpected higher bill is never pleasant. If you need assistance understanding the charges or believe you were charged wrongly, don't hesitate to reach us out through our available channels here so that we can access your account and review the whole situation with you.
We hope to chat with you soon!
