Teljoy unfair business

Fen 2016 We opened an rent to own acc for a TV and washing machine. Paid up and got a 2nd TV in May2019, installment R269.00 due to the Covid-19 we are now in arrears. I requested an invoice and was horrified, installment of R95 and R23 was added -fir the paid-up articles, We were never informed that we had to notified Teljoy that we want full ownership on paid up articles. So now we have an account of R4713.00 outstanding. When we questioned the amount only then they notified that we now need to I form them of the ownership transfer story! This is so so unfair, unprofessional, were are the commitment to keep their clients happy? The ownership transfer-dtiry was never never discussed when we signed the contracts?