Extremely poor service

I paid for an uncapped 40mb line in February which never worked as a 40mb line, it was more like a 1mb line of which my whole family used 500mb for the whole month and we only had access to YouTube and Facebook which You took minutes to load a video. I called almost every day after work trying to sort this out which it never was and I decided not to pay for the month of March as I feel I was owed money due to not receiving the service I paid for. I have now been waiting for a call back from the accounts department since the beginning of March and I are as of getting a ln email saying that my issue has been resolved I get I one saying my account is being suspended. Truly disappointed in the service