Bad client service

I took out a finchoice loan a year ago, debit orders has been going off timously from the same bank account every month . To my surprise I get an sms a few days after the debit order went off to say that my account is in arrears. I called into the call center many times to find out what was going on. Very unfriendly and unprofessional staff. I was told to send proof of the debit order going off. I sent this.Till this day they are still '' tracking''my payments. As a result my credit score has been dropping tremendously. I am in the process of buying property but cannot due to this. I then get phone calls every day about my arrears account, after I explained to the third agent, he then dropped the call. Extremely disappointed with Finchoice customer service. Never making use of their services AGAIN.