Bad Service

I've done a debit order switch account with them on the 3 of March 23 and that was never until I wrote a review on hellopeter and the was done in May 23 off which is was very late and I had to transfer the funds to this closed account for my debit orders. The reason to close this account it was for MTN because the debited R11 000 from my account for my contract for data that I did not use. Now FNB is saying that I'm owing that amount. They must joking and I regret switching to them.