Remitano is not a Nigerian platform; they provide services to 50 different countries, including Nigeria. I've tried Remitano and stopped using it because their rates are usually lower than other peer-to-peer exchanges and most vendors don't sell at the listed rates; instead, they will start begging and bargaining.
I have experienced their begging before, which is what I normally do to report them. Anytime I use Remitano, I notice that the direct converting option they provide, which is from USDT to NGNR, is usually higher compared to the rate given by P2P vendors, and when you want to make a withdrawal, it's also faster to receive the money when you use either GTB or any microfinance bank like Moniepoint. They will only charge a fee of 200-500 naira; the fee always varies, but it has been more than a month now since I last used their service.