Discovery doesn't value their customers

I called discovery in 2022 to change my address on my two cars and as a result they gave me a new instalment to my surprise my instalment only decreased by a few rands and I asked the agent that was assisting me why because my new address is at a more secure area but still I accepted the new instalment . A year later, in 2023 I call Discovery again wanting to change my address on my 2nd car, only to find that the address for both cars was never changed and this would explain why my instalment didn't change much when I called in 2022. Deryl captured my new address on both cars and gave me my new instalment and I was happy with it because it was way less and then told me that Discovery will repay me the difference but he can only load a 3 month repayment and his manager will need to investigate for repayment for the rest of the remaining. Fine I was happy with all that. A month later, Discovery debits my account and took the old instalment. I call them then a lady named Shamanie N assisted me, saying she's just helping out Deryl. She said Deryl didn't activate the new instalment but she will talk to him and her manager and Deryl will call me back. She also said I must send the date of when I changed my address in 2022 and I did that. I have not heard from Deryl till today, I've called and emailed Discovery to get assistance and nothing still, and Shamanie N then sends me a hello peter link so I can give her good rating without even following up if I did get my money back from Discovery and that my new instalment was activated. Till today Discovery has not rectified their mistake, they have not paid me back and I'm not sure what my instalment is. When they want their money they want it, but when its time for them to pay you back you have to climb Kilimanjaro and still you don't get your money