something triggered me to ask this question, As a new trader As I am, we know very well that binance is no longer in Nigeria any more. some weeks ago I paid for particular coin and the seller refused to release the coin to me, the next thing he do. He went Off line for about 3 hours before coming on line again,at the end of the day he released the coin to me after 3 hours. because binance security was so secured, if the person doesn't want to release the coin.you can quickly go to appeal and everything will be settled, after giving them the screenshot of your payment receipt.
Appealing is just the best thing to do whenever some one refuses to release a coin after payment buy then since Binance isn't available in Nigeria again you can get to try other exchange and see if they will be able to offer same service but for the sake of security, make sure to transact only small amounts first so you use that to get an idea into what their security action looks like because it may differ from that of Binance, Binance happens to be the number one exchange and so it's usually expected of them as the number one to be able to have good security protocol which ensures the safety of their customers buy i don't know how well it is actually with others so if you are trying others, always make sure to use a small amount for trials after which you can proceed to doing huge transactions.
With Binance P2P whenever issues as this arises you can easily appeal and their customer service which is usually very quick to response will definitely respond as quick as possible but i don't really have an idea into how quick it is with other exchanges and that's why for a trial start with small amount.