Now my new line was declined

I'm a Vodacom customer for 12 years now, last month Vodacom deducted a wrong amount from my account, I am pleased to say that I was refunded and my banking fees was also paid by Vodacom. But because of this, a new line was declined because of the debit order that didn't went trough (when Vodacom deducted the incorrect amount). i'm very unhappy about this, because my account is always up to date. I really would like to add this new line, if not I'm sure that MTN or Cell C will be more than happy to assist.