Worst bank ever

My debit order for my vehicle went off on the 31st of March I've been receiving calls since the 2nd of April from them telling me I haven't paid yet and I tell them every time that the debit order went off and they need to correct this and every time they tell me it will be solved the next they and now more than a week later I'm still getting calls and then still being told "Tomorrow" Both the finance account and my debited account is with standard bank but somehow they can't fix this. This is easily the worst service I've ever received from any business.