Payment Plan a joke!

I have had it with Telkom! What is the point of having a payment plan in place? I specifically asked for a plan where I still pay an amount and the lines won't be suspended, was told yes it's possible. Right! The agent and I spoke and he did some maths for me where I pay 30% upfront no suspended lines and all good! Now my freaking lines are suspended after paying said amount, they keep trying to debit my account and because the payments have bounced my bank account is now in the minus!!! I paid the 30% in cash at PnP.. I mentioned that the payments would be in cash due to the fact I'm not getting full salary.. Telkom.. how is your payment plan helping me if you guys are only making it worse? I've phoned already, was told a manager would phone me back.. never happened!! Pathetic service!