Invoiced for service but not done

In September 2017 i requested an indoor transfer, they have to date not done it after i logged it 3 times already. I have also contacted them and ask to reverse the charge on my invoice but to date is has not happened. I have not paid that amount due to the fact that the in door transfer was not done yet. I get charged interest on the outstanding amount monthly. I have contacted them more than 4 times now to dispute my account but they do not resolve the dispute. A dispute should be resolved in 2 days according to a source I have. Everytime i speak to them they say I must relog my request for the indoor transfer, my question is why? I have requested it and it is still not done. When will this ever get resolved? I will pay it as soon as it's done.