Flipkart — Trying to update new number

So I'm trying from past 4 month's to change my current Flipkart number to another one which is new sim and I just want to switch my all accounts to that new number but when I tried to change it I got following error :- unable to change number, please retry, after trying many times I did a call to Flipkart customer care and they told me that the number which I want to update was already registered and that account also banned by Flipkart I just surprised I don't know when it was registered or maybe that number used by another user earlier before I got that. I explained everything to the customer care executive I said my all banking and other government realated services are linked to that new number and I just want to update because I don't want to carry both sims. I asked for help executive told me that he registered a complaint for unban account and after unban just deactivate that account and update with your older Flipkart account but I got mail today just with reason why that account was got banned and the ticket was closed without solving my issue. Kindly help me 🙏