PRETOR Group lack of communication and incorrect billing and unfair listing

I recently took a lease with PRETOR Group, a month into the lease after paying deposit and prorated rent as per email and whatsapp text received from Winnie we were made to complete another lease as there was apparently a fault with the first lease and the Pro rata rental paid (not much detail was given on this). When I received my statement for May, an additional R200 was added to the bill. I sent an email enquiring about this, but only received an email from Shaun after I had paid May rent who advised that their email was down, however I hadn't included the extra charge as I didn't know what it's for. In the email he advised that there was a shortfall on my deposit and I later received a text for a listing on a default in payment on my account. I have been sending numerous emails to Winnie, Shaun and Bets who sends monthly statements to elaborate on this amount.

I do not understand how can a lease state one amount and I get billed for a different amount after I have paid. I even called Winnie who said she would look into this, she hasn't called back and ignores my texts. This R200 was Included again for June rental.