Vinted complaint: Customer service issues /funds withheld

I contacted customer service to ask why my funds had been withheld and sent then the Royal Mail proof of receipt photo to prove the buyer had signed for it, I also sent the original receipt from the post office where I posted the item from. I also sent the buyers user name and the item she purchased. I get a reply “please tell me the user name” I send another email to tell them I have already sent you this info along with the receipt and sent them all again on the new email. I get another reply please send receipt! Again I replay I have already sen their info and sent it all again. This has been going on for 4 days now. Every time I get a reply they ares asking for the information I have already sent. I have now sent the receipts, the proof that the item was signed for, they user name and the item 14 times. I just got another email asking the same thing. What is going on with this company? They are either unbelievably bad at their job or are doing this deliberately to avoid releasing my funds. Just to add to the story I contact the buyer on the day she received the item to ask if everything was ok and she ignored me. I have since sent the proof of receipt and she has still ignored me. I am absolutely dumbfounded at the service this company have provided.