I have been sent Bitcoin but although the TX shows up on bitcoinexplorer and BscScan I have been informed that the Transaction Hash is fake.
Which bitcoin explorer? Also BscScan is not for bitcoin. OmegaStarScream has listed some of the explorers that you can use, but blockchain.com is a wallet, it has an explorer which is
https://www.blockchain.com/explorer. There is another one called
https://blockstream.info/ which is also a bitcoin explorer.
Alternatively, you can post the txid for us to help you confirm this.