Horrible Service Delivery

I have been very patient and resorted to this page out of pure desperation to get my problem resolved. I have been with them since 2019, and at the beginning, everything went super well - I even left a good review- up to about 2 years in. Then whenever you call, there always seems to be a reason why they can't help you. Now I have settled an account on the 22nd of May. There have now been 2 debit orders since going into who knows where and upon requesting help I have been told that they can't do anything, and I should not worry because it will be paid back. I understand that the settlement letter needs to be received, but that takes 4 weeks to get - it's been 6 almost 7 weeks since I made them aware that the account has been settled? I am pretty sure it does not take a month to pay back money that went into the wrong accounts. I have now requested an update to which they said they will get back to me - and I am still waiting (This was on the 21st of June) - Then I followed up on the 25th, and there is still nothing. I have now followed up on the 3rd and have not even received a reply of any sort. This month's payment(25 July) will settle my last account if all the money that has been paid into the wrong account can be put into this account, but it seems like they want to keep me paying for no reason. Can it take up to 6 going on 7 weeks to solve an issue? This is horrible service - and based on this fact alone, I would not recommend them to anyone.