Conn's Home Plus review: The inaccurate amount on my accounts

I made a purchase of a bedroom set in August 2020, I have had problems with the purchase with the sales rep adding the wrong mattress and they were trying to charge me to delivery fees for their mistake. They don't give You a contract and I sent paperwork to them to drop the insurance and furniture gard and I don't know if it was taken off. I have talked to the Harvey, Louisiana store managers and sales rep about this situation still no resolution. I have called customer service to get a new contract with the right amounts and nothing. One of my account suppose to be 137.59 and the guy in customer service told me I need to continue paying 153.22 that's not right. I am so tied of talking to customer service reps because nothing get done.