Poor customer care service from accounts department.

I received an email,from Le Morgan accounts department in late November advising that I can change my debit date for December should I wish to do so and I could also settle the account If I want to do so and if I settle I could qualify for a discount,checked my statement and realised that I can actually settle the account since I had paid most of the amount owed. I called the acounts department requesting settlement amount and a reference number,they sent everything by sms and there was no discount.I did not care since they never said discount was guaranteed.I settled the account and sent the proof of payment.They acknowledged receipt of proof of payment and advised the funds paid would be allocated to my account. The debit date came and I was debited for a settled account,I sent the proof of payment again and enquired why I was debited,a reply came and I was told the request for the debit was already sent for the debit order when I settled my account.I was told to reverse the money myself since the acccount was closed already. I did that and now I am receiving an sms about the reversed debit and Le morgan is now asking me to deposit the money I reversed which was wrongly debited. I cannot deal with this level of incompitence,please sort out your issues and give us an excellent service that we deserve..