Myself and another user already advised you on how to correctly report a user directly to Bungie and you mentioned you already did this. You don't need to do anything else.
Once again, review the below link for instructions on correctly reporting an individual. The link below contains all the information you need.
https://help.bungie.net/hc/en-us/articles/360049497451-Report-Suspected-Cheating-and-Poor-Behavior
In short, report, block and move on with life. Only takes 10 seconds to do that. You're always going to run into individuals looking to harass you on any online service.
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Appreciate the help!