Debit Order Not Working

I filled in a form when getting my internet account for a debit order to come off my banking account for Telkom so I wouldn't have to worry about forgetting to pay. Now my line had been suspended due non payment but as far as im concerned it isn't my fault that the account wasnt paid because i specifically asked for a debit order to be set Up so I could avoid this. I went to Telkom in N1 city and was told that I needed to pay the outstanding amount before the line would be reconnected. I need this line for my work and I find this unacceptable that my line is d suspended due to a mistake on Telkoms side. I need my line reactivated immediately or I will cancel my account with Telkom and go through another internet provider. I had so many problems just getting this line installed in the first place and now I sit in this problem and it is not acceptable. I need my internet reconnected immediately for my work. This is not my fault so I don't see why I should sit with no internet because of your mistake.