RCS is the worst service provider

I purchased a fridge on account at Makro. RCS is the financial service provider. I have been paying my account via the Makro Credit mobile app. Two months ago when I tried to pay my installment the app suddenly kicked me out and I when I tried logging in again it showed I have exceeded my max attempts. I know for a fact that I did not enter my pin wrong three times. Non the less I was locked out. When I try to reset my account I receive the error "We are unable to validate your information". Now the really bad parts starts. I called the number that is instructed to call at least 7 times. If your lucky enough to get through you are advised to email screenshot to *** with all your details to have your account reset. I have done that and followed up on that email with no success. All the time the keep on negatively affecting my credit score. I am at the point of going to a loan shark and borrow money from him just to pay off this account and never have to dealt with RCS again.