Chance TAKERS! **********!

I had ordered a duvet set in December 2019 on credit and the agreement was that I paid over 6/7 months if I remember correctly. Every month when I’d pay they would send me a statement and for the first two months I paid R165 then third month I paid R200 (because I wanted to quickly payoff the debt). After the R200 payment as per normal they send statement via SMS with the remaining balance which was R339.27. Today (30/04/2020), as I was about to payoff the remaining balance I receive a call from one of their rude sales agents (didn’t catch her name) asking when am I paying them and I tell her that I was about to process the payment as she called. She then stated that the balance is R380 which is a service fee that is paid every month and mind you for the past 3 months that I haven’t been paying paying any service fees and there is nothing that stated that when I made the order. They sent an SMS of the balance which is on writing that my balance was R339.27 and today I get a call that I owe them R380. I paid R340 as per my balance. Lastly I then went on Twitter and I see that people that paid of their debts were also called and told they owed R40. What BS is this!!!