devtrackers.gg
You should open a ticket. Click the question mark thing next to your cp on the start menu like in the picture. There you can talk to support. They do respond a bit late tho
Heya, just chiming it to first say thank you u/xSnakyy for the good advice and also to OP to say that our support specifically has a whole process around account recovery. If the Activision account is compromised, which sounds like it is the case since you are saying your Google account was recovered, then our teams should be able to assist.
You can also head to the support site here since it is account related (doesn't have to be through in-game chat): https://support.activision.com/cod-mobile/articles/call-of-duty-mobile-security-enforcement-policy