thank you for you time
check a block explorer like https://www.blockchain.com/explorer and search the transaction hash they gave you. if the transaction exists and was confirmed on the network, the next step is to confirm that coins in that transaction were sent to 1. the address you gave ACR and 2. an address you control.
without seeing a transaction hash and knowing what your receiving address is, we can't verify what happened. is it possible you provided ACR a cashout address you didn't really control? for example, if you accidentally copied/pasted from your sent addresses rather than receiving addresses, or had malware on your pc that changed your address when you pasted it. maybe you received the cashout but your wallet was later hacked and emptied since this was 3 months ago---did you check the transaction history in your wallet and not just the balance?
i remember ACR made it pretty difficult for me to withdraw coins. the first time the withdrawal just failed without explanation and the second time i had to jump through a bunch of hoops like a live phone verification. i eventually got my coins though. but if the withdrawal is already showing as completed in your cashier and they're providing a transaction ID, you're already past all that red tape.