Why bother to pay and send in documentation!!!

A client payment went on hold and the 1 Sept 2015 debit order did not go off. As soon as the cheque was cleared payment was made on 5 Sept 2015 and documentation supp****. Repeated calls and repeating the process carried on until 18 September when the lines were disconnected. The documentation was supp**** again and the lines re-instated the same day. 1 Oct saw a double amount go through the bank but as this had not been anticipated the debit did not go through. A manual payment was processed and proof of payment emailed through. Today the lines have been cut. Neither payment (despite multiple proofs sent reflect against the account). It is impossible to get anyone to sort out the matter.