gypsum plaster

I was affixing a wall anchor to a hollow plasterboard and the bolt inside rounded because it was defective (it round two more bolts). So I removed it and of course damaged the gypsum. Can you advise on how I can fix this to attach a new wall anchor? John **picture of wall anchor and hole attached.

Hello all, looking for some advice please on an issue in our property. We have a ground floor bathroom with the internal side of the external wall that had some cracking and damp marks. I have stripped back the gypsum plaster to reveal a mixmash of brickwork, breezeblock and concrete which I...