Bybit is not the only P2P exchange in the world, you can try others like Binance, Bitget etc. But make sure they are the top-rated ones to avoid a scam. In my experience, they are all good with their P2P service, and their rates are always similar. You have nothing to lose, instead of wasting your time with Bybit that is not cooperating, or using a third party like your brother for your exchanges.

If you must use Bybit, then you need to be patient with them, but keep reminding them until they do the needful. Nonetheless, avoid having a cent in that account until it is resolved. Also, have you tried their live support? If not, please do.