Instruction not adhered to

About 2 months ago I called in to cancel a monthly recurring 2gb data bundle i had purchased a while back. I called in cause I could not figure out how to cancel it on my own. When I called in the gentleman struggled to cancel it but after a while assured me it had been cancelled. I assumed this had been done and continued to pay only the required amount on my contract. I have now noticed that my account reflects 30 days on areas on my credit profile. This is unacceptable as i expect my instructions to be fully adhered to. Please ensure that the 2gb recurring data bundle is cancelled immediately and that my credit profile be rectified IMMEDIATELY!!!! The contract number in query is ***