Bad service

I had a bad experience with this guys at the beginning everything went so fast got my fibre within a week the internet is excellent got no problem with that. My problem is the provider told me the first month is free and then the second month I must start pay. Great we paid the second month R520 the 22nd May we moved to a new premises I informed them that we move and that we want them to reinstalled the fibre to the new address well that went a dead end they couldn't help me with it. I called them again the beginning of the month to assist to get fibre installed the guy who helped me was very help full but again they cansel my subscription cause there is an outstanding amount of R2738.07 wow is there something wrong at they're accounts department yes I know I owe them but in brackets its R413.07 which was supposed to be free and R520 ÷ 31 = R16.77 per day × 22 days = R369.03 so if you add it together you get a total of R782.10. The accounts department need more courses to add amounts together. They were supposed to call me but it also went to a dead end. I want to know what is going on why didn't anyone call me back.