Vodacom has failed me again

Vodacom has failed me again I don't know what do I wrote a complaint about them last month they promised to resolved my issue but my name is still in arrears I can't do anything I can't even buy a car or renew my lease because I'm on arrears I'm tired of this. Last month i complained about them for deducting my money on my pay day where else I made a premature contract cancellation with them in December and paid all the outstanding amount firstly I was helped by a very rude Vodacom guy who also promised to resolve this issue.. apparently they told me they didn't receive my cancellation documents they only received the money I ask them how? Nobody gave me an answer I then told them to refund me and remove my name on arrears and close that account they said they did but only to find out they didn't I also told them to cancel the contract because according to their system my account is still active instead of proceeding with cancellation they change the account into prepaid I questioned them they promised to get back to me but they didn't I'm still waiting for them till today my payday is in 3days time they will take my money I know