The most *** service ever

My installments has been increasing monthly ever since i have bought the car... when purchasing the vehicle with KIA North cliff I spoke to Steven assisted me to the best. he even followed up daily if im buying the car etc. I told him what i wanted to pay. The price of the vehicle kept changing etc. I told him i wanted to pay a certain amount including warranty, service plan and shortfall. he was happy and matched everything. After driving the car and things started increasing he did not want to hear anything and kept saying speak to wilma - the fni. I purchased the car in July and having been in contact will Wilma from September- she did nothing for me. She promised me she will call be back but never did. apparently i had 2 service plans and she will remove one and everything will be fine. guess what its still increasing. All the commissions for my vehicle they have eaten yet im suffering to pay my car installments. being a lady and doing this on my own not knowing about car u guys are taking me for an ass. please sort this out or refund my premium and come fetch your car.