if its an unconfirmed trransaction then that means they have sent it to the blockchain and you will get it eventually

i assume it is BTC?
if so, then the problem is because there is a massive backlog of transactions right now (and for the last 7-10 days)
there are currently over 50,000 transactions queued up, and more being added all the time!
see https://jochen-hoenicke.de/queue/#0,30d

not much that coinpot or anyone can do until this clears - hopefully over the weekend