Items missing in transit - Vinted calling me fraudulent

I honestly have no idea what to do with this.

I’m a Pro Seller with over 700 positive feedbacks and I do everything possible to keep my account in good standing.

I sent 2 items on the same day, at the same locker. Both items arrived to the (separate) buyers on the same day. Both had the items missing from the package.

Now other Pro Sellers have advised me to ALWAYS take a photo of the package I’m sending on scales to show the weight and the buyers postal label. I did this with both these packages.

Both buyers also confirmed to me that the tape surrounding the package had been cut and that’s obviously not how I sent it.

I received a threatening message from Vinted saying they cancelled the transaction and have ‘reason to believe’ I did not send the items and I’m abusing the refund system. If I do it again they’ll ban me indefinitely. Obviously I was mortified to receive such a message and sent them proof that the buyer confirmed the package was tampered with, and the photo showing the weight of the package etc.

They sent a message back with the same copy and paste bullshit still stating they believe I did not send the items. They haven’t even looked at the clear evidence I’ve sent them to prove this is not the case.

This just adds to the fact they keep restricting me for ‘commercial selling’ when I’m a Pro Seller, but refuse to tell me what I’m actually breaching, and honestly I don’t know where to go with this. I’m now out of pocket for these items and the buyer has been refunded but hasn’t received anything either. Vinted customer service is honestly the most unbelievably poor service I’ve ever experienced.

Anybody got any advice on where I can go with this? Thanks in advance.