Ongoing Debit orders even after paid up letters

After reading all the other complaints here, I have lost faith and hope that our queries will be attended too. Anyway, I settled my account on the 19.12.2017 and was debited again today(28.2.2018). After I called on the 13.2.2018 and this was confirmed that my account is settled and was sent a paid-up letter.

I called and Ergfsaans said its a matter to be dealt with by the debit order department who are never available and never answer the phone!!.

All I want is my money back as I have been loyal and made payments on time every time.Based on all the other customers on this page, it seems like its a norm where accounts are settled but we are still debited. Pathetic and annyoing service from JD Financial services.