I have bought two top ups. 3gbs and a 1.5gb just today and yesterday. My app says I have over 6.5 left for two days and I just got a message saying I have went over on my data. I will be calling tomorrow. This needs to be fixed ASAP.
If you added data top-ups they should be reflected on your Fido app and usage should be tracked in real-time.
Did you make any changes to your plan this cycle other than the top-ups? If so, it may affect what the app shows until a new bill cycle starts.
That said, which message did you receive? Was it a warning of 90% or 100% or was it a message that you were over by $50? Also, can you try calling *3337 from your Fido phone to see usage? Does it match what the app says or does it say that you have used up your data?
Let us know, we'll be more than happy to look into things.