Transferring subfolders

Mounty NTFSI was transferring a subfolder “B” from the Mac to a Seagate External HD via Mounty NTFS. Destination was inside main folder “A” on the External HD. Subfolder “B” had the same name of another subfolder inside folder “A” and asked me to merge both subfolders “B”. When I clicked on merge, all files and subfolders inside main folder “A” disappeared, including subfolder “B”.
I’ve tried mounting the hard drive on another mac and the main folder “A” seemed to be empty.
I got a quote from a data place and they mentioned that their diagnosis was:
1. Disk read error
2. Unstable/Failing read/write heads
3. Logically corrupt file system
4. Hard disk drive/s have failed
5. Media surface is degraded
They gave me a quote and I’d like to know how much this work could cost in your opinion.

This 8TB SATA HDD was a secondary drive inside my PC running Windows 10. There’s around 4-TB odd of data on it. It is 3 years old and we think has become corrupted after a Windows 10 update shut the PC down a few times. The PC no longer recognised the drive but when I put the drive in an externally powered enclosure and it did power up a few times and I could see the files but it kept timing out so I could only grab 1 or 2 folders before it timed out. Windows 10 suggested a disk repair and I clicked yes but the disk enclosure power timed out whilst doing the repair and now the drive can no longer be viewed in Windows. The files I wish to retrieve are photos and videos.

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