Coinbase complaint: Missing transaction or wrong delivery

Hi i sent my GTC token (amount 1251 ) sent from my metamask wallet address
0x4C83Ab4B76e7Fc49BE9Eb61Ff50880213Eb5F70b
to coinbase ETH 20 address
0xAF96909640FfDeCF1FfeA887351E6DC945Ee6D60 on 17 may 2024 8.04.11 PM UTC, However coinbase have stated that have not received any transaction and advised me to contact yourselves ,metamask to sort it out. I spoke earlier to coinbase and to metamask regarding this matter but metamask said it’s not their responsibility because they supposedly sent the transaction successfully. And they recommended that i send the attached screenshot to the conversation so i have attached copy of the conversation to you with metamask. I am very concerned that my money has disappeared into thin air and i look forward to you sorting it out please. This afternoon I Saturday 18th may I spoke to a Coinbase assistant who informed me that my transaction a gone to a third party and that coinbase did not know where my transaction has gone to. So neither Coinbase nor MetaMask seem to want to take responsibility for the disappearance of this transaction. Can you please look at into this complaint with the utmost urgency.
I have attached the conversation that I have had with both parties.
Regards
prabjot singh