I had this problem in late January with Cryptopia and mining-dutch. The problem seemed to be the hard fork that required wallet updates. The transactions came through after a couple of weeks, presumably after both of them had updated. (Not sure which was the cause, but I filed support tickets with both and it worked itself out.)
If you have any question about whether or not a transaction occurred, remember that you can check the blockchain directly using an explorer such as this: https://prohashing.com/explorer/Verge/ or this: https://verge-blockchain.info/
You will need some kind of transaction reference from the sending site. Looking at the transactions in H2C, try using the TX # for the one you're interested in.