I try to block /aac command and the command works perfectly even after disabling it. If you want I can send the plugin of the /aac command to check it. Thanks!

Can you send me the plugin?

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Normally It's a premium plugin but I have the cracked version of it. Is it ok?

where can I send you it

I cannot do anything to fix it.

I believe the owner of AAC has done the same thing I have to block commands, but instead did it to enable /aac. You can try removing aac.version by doing adding -aac.version to their permissions, but I do not think it is going to work.