Are you expecting a Bitcoin transaction to your wallet address? Or perhaps you made one and it’s still pending?
You'll see how many unconfirmed transactions there are at the moment, and this number continues to grow. It's fairly known issue of the Bitcoin blockchain due to current high demand for BTC. Too many people are trying to send their coins, and no one can speed up their transactions. When the traffic is heavy, it is OK to wait for up to several days to have your transaction confirmed.
If you come across such an issue, first of all, check the number of unconfirmed transactions via the links above. Your transaction is probably somewhere there. There can be other reasons why your Bitcoin transaction is being processed slowly. However, before submitting your support request, please make sure your transaction isn’t stuck in the Bitcoin traffic jam.