You might want to read the article on what GMs can and can’t do.
With rare exceptions (determined by the Developers), GMs are not allowed to grant quest completion, esp for something that can be repeated later. They also don’t take bug reports, and can’t fix bugs.
It is only very rarely the Devs let them grant rewards that were “lost” due to a bug - normally it is fixed at a Developer level with a patch that lets player then complete the content again for the reward. Those rare times Devs allow it, it is allowed for every player encountering that issue, not for individual players. How long we play, how much we pay, etc. does not factor into anything.
They don’t ever accept “proof” from players, and don’t just grant things people ask for as a “goodwill” gesture. It sadly would be abused.