Hello Debosree,
Welcome to the community!
I'm sorry to hear you've received calls from people thinking you've been calling them. I understand that can be concerning. The calls are scammers or spammers using spoofed numbers. In your cases, they happen to have spoofed your phone numbers. Unfortunately, there isn't much providers can do to prevent SPAM calls. As you are aware, the numbers shown on caller ID do not belong to the spammers. They often belong to innocent, unsuspecting people -- such as yourself. Unfortunately, there isn't much that can be done to prevent numbers from being spoofed. Even the RCMP are not immune to being spoofed (see here and here).
Rest assured that it is unlikely your phone number has been hacked. All phone numbers -- whether landline or mobile -- are in databases which are readily available online (see here). Certain prefixes are designated as landlines, others as Rogers, Fido, Bell, etc. All a spammer/scammer needs to do is have a computer sequentially dial the numbers of a desired area code/prefix combination from 0000 to 9999 and all of those customers would be with their desired target (see here). The spammers/scammers will often pick a phone number within that area code/prefix to spoof. Since the calls appear to come from similar numbers, it's called Neighbour spoofing (see here). Unfortunately, with those calls, they appear to have chosen your number to spoof.
The mobile providers have implemented Universal Call Blocking as a measure to try to reduce the amount of nuisance calls. In addition, a new technology, STIR/SHAKEN (Secure Telephone Identity Revisited/Signature-based Handling of Asserted Information Using Tokens) has been adopted to further reduce the amount of nuisance calls (see here). Unfortunately, however, those measures have their own limitations.
Hope this helps 😀
Cheers
