Unprofessional and bad service

This company is so dissapointing you never get a statement on your balance I have made several payments and when I phone them then they did not receive the money or the money was not allocated yet my amount stays the same even with that payments I made before so I just decided not to continue paying them as to which I'm paying money against the wind I phoned them every time when I made a payment then I must hear there is no money they even gave me another bank account and the same happened its so stressful now they sending me letters of demand as I'm at fault and not paying but their service is bad accounts that was paid up I have never even received that paid up letters... 😔