Terrible service

13 march bank details changed. Was advised all successful and my debit will go off. This dint happen Called 1st april told consultant to update bank details he says no problem its done still no debit went off Now i get told im in arrears for 1900 yet i keep calling spending almost 1 hour at a time asking them to sort this out It’s ridiculous that i have to keep chasing them to sort out their fees Now i need to pay an arrears amount for something i dint do. My itc reflects badly because or incompetence

This needs to be sorted asap