Vodacom makes me pay for their fault

I have a contract with vodacom since 2010 and have never skipped a payment. Earlier this year I called in with some issue and we ended up talking about my debit order date with a consultant but after a few days my line was blocked. Upon enquerying i was told my debit order didnt go off and was changed to cash deposit. I never asked for such so i rectified it and went to pay cash at the bank. Now i want to take out a new contract and called in but am told my account isnt performing well due to the incident with the debit order. Appaling how an *********** consultant edited my account and there was no sms to check if i authorised the change. Worse part is being penalised as a risky customer when for ten years i have been paying my account in time...