Unhappy dissatisfied

I am not happy i have made arrangements on my account because they said i owed them so i agreed to pay it off over 12 months fhen they told me i needed to pay R1245.00 which was my subscription fee plus the add R112 we agreed plus I paid 2 smaller payments one of R204 i think And another R147 now i get an sms saying my debit order reversed i need to pay but on my account it shows i need to pay R691 why what's going on i tried calling in that whatsapp robot is useless and i can't get assistant on the live chat on self service i mean it's lockdown i won't even get paid at work were must i now get an additional 691 after i made a payment of more then the 1245 they wanted i paid R1380.00 I have emailed the lady i spoke to last time after lodging a complaint on here but its back to sqaure one again