I have alerted support to look at this thread but if you can't wait for that, there is telephone support available specifically for Anti-Theft:
From Thailand, dial 001800-441-6517
Support hours: 24x7x365
Thank you very much.
I think I'll wait since I've seen many people who didn't get an answer from phone support. Actually, I've also tried the online chat but online-support staff told me that he's not trained for this service.
Yes, regular Technical Support staff aren't trained in MAT. OK, good luck.
Removing MAT from control panel alone will not disable AT. You may need to un-enroll the Device for the decryption to happen completely. Post here whether you contacted Tech Support or else I can assist you further.