Line suspended and requires a lot of money at once to get them.

My lines have been suspended by Telkom since Friday. I have called them 3 times to assist with logging a case to resolve the issue the case was only logged today morning when I called again for the 4th time. I was told that I have exceeded my credit limit due to an upgrade that I recently took. The sale person from protea glen Telkom said to me I will continue to pay my bill on a monthly basis. Only to be told that I have to pay 4000 in cash to get my lines opened if not they will remain closed. I even when I asked for the payment to be done in installments they said that there's nothing they can do I until I pay the full amount I'm not a bad payer and I have not missed any of their payments.I don't that amount to pay for a phone that's why I chose the contract route. I was never told of a once payment of 4000. I wanted to take another contract for the phone and not an upgrade only for the consultant to say to me that you can add a device on your current contract and this will reduce your installment. And nothing was mentioned regarding a once off payment