Fuck Mercari

This is bullshit! Not even 1-2 day expedited shipping cost this much. And this was for 1 Lego set that didn't even weight 16lbs.

Does anyone have any suggestions on how to resolve this and get a refund?

I have went through the help/support messaging system, and been getting the run-around. The message do seem to repetitive and similar in structure..... probably AI generated, which is even more frustrating because It means all my efforts have been for nothing.....

Any advice greatly appreciated

Thanks