Seagate lost my hard drive / Netherlands

Hello everybody,

writing here because honestly I don't know what to do. I sent my hard drive back to Seagate because the USB-C connector came loose. They agreed to repair it and recover my data - easy fix. I got a shipping label from them, sent it to the given Amsterdam address via UPS. Now for four months they weren't able to retrieve the hard drive, sending me the same generic email 35 times in a row only to tell me today that "UPS can't find the package" when I could clearly see that it was delivered to their address.

I'm furious, there's important data on this that I cannot afford to lose and they just lose the whole device? Come on.

What should I do here in your opinion? Should I involve a lawyer as this is literally costing me money to lose this data?

Would love to have some opinions from you.

Thank you!