jaylucy
If you asked the man from the shed place to do certain jobs, that is what he will do - nothing more unless you have pointed out the damp etc in the first place.
I'd certainly get rid of it and start again - with proper things done to at least get rid of the damp underneath.
I rang up his company initially explaining that I had an old shed I would like him to come and look and see if it was worth repairing, he said it was and had another 7 to 10 years life left of it but he failed to pick up the rot around the outside of the shed which I am pretty annoyed about but will triumph hopefully…. When he presents me with the final bill I’m intending to knock off the amount I have to spend on a carpenter to fix the rot