Telkom - I would pay any other service provider more just not to deal with them

$%*&!#. Have been struggling for more than a year to get them to stop charging me for services that they have charged me for without my consent. More than 10 hours worth of calls not even including the times I went into the branches. They launched investigations (which I had to phone to have them restart it 3 times as they never actually did anything) and 12 months later they gave me a call back, apologizing saying that it was their fault and credited me with R5000 for their mistake. Just went to another store to take out a contract and was refused for outstanding bills at telkom!!! Ruining my credit record for absolutely nothing but pure uselessness from your side.

Also had Telkom trying to load someone else's account onto my name. Is there any regulator or authority that I can go to? It is affecting all my other accounts and credit record that I do not know what to do anymore.