Money paid into wrong account after they confirmed to have the correct details

Worst customer service ever. You keep on phoning the call centre and they make as if they cant hear you. When they pick up eventually they drop the phone again. After I have given them my correct banking details be for sure the debit went off on time as usual. After I app**** again - went into the wrong bank account. How is this possible after they confirmed via email my details is changed. I will have all my debit orders bounce because of their negligence but who cares of that impact as long as they get their money. I also start paying interest on money I don't even have. And now once again I must follow up and beg and remind? This is pathetic ! cant say service cause there is none.