Overcharge and Payment Plan Update Not Reflected

I chose plan 3 when I registered in January this year since I wasn't certain that my organization would cover my tuition at the time. And when my company's bursary was approved in February, I gave you permission to update my account and asked that you send me a statement of accounts. After receiving it, I sent an email asking to be put on plan 1 so that I could pay my fees in full. Since I was unable to modify the plan on the student app, I sent the email.

I received a call from finance, and I was assured that it will be fixed on their end and that I would be put on plan 1. However, when I received my statement yesterday 17 April, it was still incorrect, what is even more annoying is that the statement now reflects that I owe Mancosa 1200.

Calls to me as a client have not been pleasant over the 3years especially from finance; may this be fixed so that I can focus on my studies and be done with the institution, I just need Mancosa to credit me my 4000 please.