MTN worst service provider

I went to MTN Brooklyn on 7 May 2023 to do a few upgrades on some of my excisting contracts. The person who helped me could not do all the paper work at the time and emailed me some documents including a request to cancel a 3G data contract we have not used in months. Up to date this contract is still not cancelled. After receiving our monthly statement in July, we also discovered that they are charging us for insurance which we did not request and also charged us double subscription fees on all the contracts we upgraded on our July bill. We went to MTN Brooklyn on 12 July 2023, spoke to Brandon Luyt who confirmed that we will send all the queries to the relevant department. We follow up with him weekly and all response we receive is that he still waiting for the billing department to get back to him. This is 3 months after we requested the changes and still no answer.