Pathetic Service

I have a contract with MTN that has expired and I’m due for an upgrade. I was sent to the store because apparently there was a block in my contract for whatever reason. When I got to the store the manager said all is clear and she sees not block. I then had to call the call centre again My contract have expired in September. I have notified to cancel the contract on their request and thereafter upgrade. I have now been billed a full month and when I’ve contacted them only to find my contract has not been cancelled and I need to pay another month.

How is this acceptable. Someone clearly didn’t do their job and I’m billed for their incompetence. This is pathetic. I need someone who knows what they doing to get back to me please