A contract for convenience turns into inconvenienc

I've been with telkom for 4 years +.but I've been in the stores more in these 3 months than I've been in the last 4 years.I recently upgraded my contact at the phoenix branch and the sales guy apparently forgot to cancel my bundle from my previous account.so anyway December come and my bill is tripled so I call in and after 3 attempts I get someone who knows Whats happening.so he explained and I said fine I know I'm overcharged but what's the right amount and can i pay it direct into an 8ta account and I did that for December cause they said it will be sorted by January.so January came and now they say I have an outstanding balance then I went into the store at gateway where they found the problem and also put a case through and he said it would be sorted out by the January debit so I left exact in my account just in case and the debit went off for the right amount but again I received an email stating that my account needs to be payed up.<br> I mean why should I be going through this whole hassle when the reason I took a contract was to be convenient.I know all this reflects on my name.<br> Imagine taking a contract for R400 and 3 months now paying R600-R700 where do I get that money