Never again with RCS

The service is very poor. So quick to get your business but then so slow to provide services and they make gross errors, such as a debit order going through on a closed account (that happened on the last loan I took out - they were supposed to close the previous account and only debit for the new one - but when it came time for the installment for the new account - they debited me for the new account as well as the closed account - which means they didn't do their job properly and cancel the debit order on the closed account. When I contacted RCS, they advised me that they can't 'see anything wrong' on their side - I had to send in a bank statement SHOWING them that they had debited me for something which was supposed to be closed (which can only mean that they don't even know what's going on with their own debit order system). Yesterday morning I requested a settlement letter on my open account - they told me it takes up to 24 hours. All the other financial services providers I've delt with provide one immediately (system driven) - why must RCS take 24 hours to send a settlement letter? Are you, in this day and age, drawing up settlement letters manually? Really? Never again with RCS.