Pathetic service

I have a contract with Telkom mobile on the 28th of August I received a sms stating that my account is overdue, yet my debit order went off successfully on the 27th of August. Today the 6th of September I received my invoice showing that I now have to pay an extra R500 and something because of my account being overdue, yet to my knowledge my account is up to date! I am extremely upset and disgusted with the service I am receiving at telkom! Not to mention when you call the call center to sort this out you wait for over an half an hour still to speak to an agent that is extremely rude, impatient and unhelpful! I would really appreciate if this could get resolved as soon as possible. It is beyond bad service!