Global Blue Has Not Paid My €300 Tax Free Refund

I completed my Tax Free procedures through Global Blue at Düsseldorf Airport for purchases I made in France, the Netherlands, and Germany. I obtained the required customs stamps and then deposited the receipts in the designated mailbox at the airport in accordance with the procedure. Despite this, I have still not received my refund of approximately €300 in my bank account since July 18.

Although my purchases from Coach, Guess, and Columbia appear in the Purchases section of the Global Blue app, the system still shows a message stating that customs validation is required. However, I already obtained the required customs approval on my receipts and submitted them as instructed.

I am experiencing significant inconvenience because I completed all the required procedures properly but have still not received my refund. I request that Global Blue update my customs validation in its system, process my Tax Free refunds, and deposit the amounts into my account as soon as possible. I also request a clear explanation of why my refund has been delayed.