Disgusting customer service

I emailed them requesting banking details so I can make a payment this email was sent the response was that I should send it tenacity customer service which I did on the 1st of September till Date no response but you guys gave the audience to add interest to my account thereafter send me an sms threatening me that you sent it to the bureau you guy what ****ing bull**** is this you asked me to pay R85 and then you threaten me to now pay R200 because you added interest due your inability to respond to my request