HHonors has not been crediting my points, they keep asking for the same infor

I know this has been asked about many times, but would appreciate some tips about how to resolve my situation.

I’m a long time Diamond member & have been staying at a Hilton Property overseas for an extended period due to a work project (I’m paying for the hotel myself). Unfortunately HH hasn’t been crediting my points properly. They keep asking me for the same info, I send it, they say it’s updated but there’s no change. Meanwhile, I’m accumulating more points so it’s getting more and more complicated to sort this out the longer this takes.

So here are my questions, would appreciate some guidance:

-Can the hotel escalate this directly, are there specific people they can reach to resolve this? (Rather than me trying to chase it up with random customer service people who reply with the same lame repeated questions to my emails)? They sent some emails initially, but I’ve been the one communicating with HH after that.

-Is there a number/email of someone, some department other than the general HH customer service who don’t seem to care?

-Is there anything I can say to get them to take this more seriously? I don’t want to say I’ll start complaining on social media etc, but would love to get them to sort this out once and for all.

-Is there a more legal sounding email I can send?

I’m really frustrated and feel a bit cheated. Any suggestions would be much appreciated!