Line downgrade gone WRONG!!

I tried to downgrade my line from a 10meg, to 4Meg in October 2015. In November I realized I had i higher telkom account, which was weird, because Mweb was in control of both accounts, and my line was still not downgraded, so I phoned again. I was told that my line was not downgraded by the previous person, but this person will handleit. and no one knew why my telkom bill was so high. So December came, and after receiving my statements my lines were still not downgraded. So I went to telkom, and I was told that my account was higher because my line billing was migrated back to them in October. So, When going back in my accounts, I realized I had been paying Telkom, and Mweb both for line rentals! So my line was downgraded at telkom, and i phoned mweb to try and have it downgraded on their side AGAIN.. I was told that it would be done, and that I should not pay my account, as an investigation was opened, and I would be contacted as soon as they figured out what was going on. Friday I received a Final warning to pay my account.. and guess what. Still no change in mweb's price. SO not only am i still paying double, I'm paying for speed im not reaching, as telkom is only 4meg.