Finchoice reap off!!!!

I’m absolutely furious with this so called Financial institution. I have a withstanding loan amount with Finchoice, on the 5th I took R1000 over & above what I owe them on Mobi App. Upon looking at the SMS’s sent to me immediately after being approved, it stated that my loan amount is going to be R602,48. I got shocked thinking why should I pay so much for R1000. I called Finchoice seeking clarity, the lady that took the call explained that my loan was recalculated over 24 months. I said to her this is crazy, I only have a small balance that I should be settling later this year why are you now recalculating this balance over a longer period that's going to incur interest? She says to me well thats how things are done. My argument to get was that well I’m not taking this because it’s not my 1st time taking these small amounts & my loan has never been recalculated. I asked to speak to someone senior, she put me on hold & later returned on the call & said her manager has knocked off already, surely there must be someone like a supervisor or team leader that can speak to me. She asked for my number & said she’ll get her manager to call me the next day. I in turn asked for her name & surname she only gave me her name & said she’s not allowed to give me her surname. I said to her since you can’t give me your surname give me your managers name & surname, that too she couldn’t give me & said she’s not in the liberty to do that. By the way I’ve verified my identification to this person but she can’t give me her surname, I mean if I should make a call the next morning & I say i spoke to Abbey & I’m being asked Abbey who? What must I say? Standard Bank is trending because of issues of this nature. I don’t mind doing the same if this kind of reap off is not going to be handled to my satisfaction. If Finchoice is doing this to poor black people who doesn’t know their rights, then I’ll be the 1st to drag them.