Very rude agents and bad service

my contract is due for an upgrade now or either a cancellation in January. I tried to upgrade the contract an the agents are telling me about a missed debit order which I have updated. the clause about a missed debit order was not in the contract I signed with Mr price mobile. I have been calling every day and no body seem to be able to assist me. the last lady I spoke to eventually told me I am wasting her time and she hung up. then I spoke to a guy named Kumesha, who told me that it is not his problem and told me that the manager who is on the floor Sthembile ncgobo cant help me as she is busy with other queries. I sent an email to help@mrpmobile and no response.