Bad service

I was forced to take and try out this new device called ZTE, used the device for 7 month and it started giving me issues where the device just dial itself. I called in and the device was collected within a week that was the 16th of January 2025. When I called in on Feb to ask when will I get my device, I was advised that they only received the device on the 29 of January. time wasted already but my debit order keeps on going even thou I don't have a phone. I kept on calling and ask them to remove my debit order and they don't. I was advised that they sent me a quote to pay my device for repairs and I am refusing to do so, that device is faulty due to manufactory and I am not paying for anything and they must cancel my debit order. I don't need their service anymore