Incorrect amount billed

Called in for my In laws to assist them that wants to cancel with Afrihost due to there poor client service and there no response time back to support tickets at all. Got through to there accounts department after holding on for 22min and informed them that i have cancelled there services on the client zone and it has a 30 days cancellation notice but im not able to change the package from a 2meg Uncapped to a 1Meg uncapped due to there is no use to carry on with the 2 meg uncapped if there lines are always down. So they changed it to the 1meg uncapped and informed that next billing that they will be charge for the 1Meg and not the 2Meg till the service have been cancelled within the 30 days notice. Here the next billing takes place and geuss what they bill for the 2Meg and on there data base its running at 1Meg but they bill for the 2Meg. So i call and the accounts person cant even answer me why and keeps putting me on hold to tak to someone else cause they dont know what to say and eventually after they put me on hold to get me more information they drop the call on me. Now that i must say is terrible service and they had no answers for me after being placed on hold more than X5 around 10min in time. Afrihost your services are below 0/10.