GPD STORE… nothing but issues.

I ordered a pocket 4 back in November or December. So it’s finally being shipped to me. GPD Store are finally shipping it except screwed up shipping and I was charged a whole $300 for import duties. We came to the agreement that they would refund me for the duties as they use DHL DDP and aren’t sure how it happened. So I paid it and sent them the invoices and proof of payment. Well now they’re telling me that they’re going to recall the package entirely and to disregard the duties payment with DHL. No mention of refunding that $300 to me since sending the proof of payment. Who else has had issues like this with them?