REPAYMENT OF A BOND

I recently bought a house and obtained finance from FNB. I signed a quote with a certain amount and was advised that it is the amount I will be paying for my Bond. Subsequently the Bond was registered on 13 April 2015, I was then provided with a repayment letter on 20th of April 2015 which had a different and slightly higher amount than I was quoted for. I called FNB call centre to try and obtain an explanation and spoke to Londiwe Sithole who could not provide me with an explanation then a few days later Fiyaard Fredericks who advised that I wait for my first deduction on 26 May 2015 as per my repayment letter and call back. Upon my first deduction, I called the call centre once again and this time spoke to Nonhlanhla Mkhize who requested me to provide her team leader Rosemary Mayaba with the repayment letter. Later then followed up with Porscha Groom, Charlene Freizenburg and Riaan Mahommed and this was in different days and all of them told me that my issue was referred or escalated by Rosemary Mayaba. I have not received any feedback and in light of all this I feel unfairly treated because of lack of professionalism and urgency into this matter.