I'm assuming you had a 6 month AST and extended, is that correct? No you didn't have to extend the AST however, landlord could have served notice on you if you refused to extend.
Please explain the fees not listed.
With regards to painting, the state of the decoration on entering the property should be listed on the inventory. And you should have checked it and agreed with it or asked for amendments at the time. If the decoration isn't detailed, the LL doesn't have a leg to stand on. The deposit should be with a TDS scheme and they will be the arbitrators of any dispute.
How long have you been there? Was the property through a letting agent?
As far as access is concerned, the LL is already in breach of contract by moving your stuff around. I would insist on letter of the law access. I.E. A formal written request with a minimum of 24 hours notice.
I'm a landlord and I would want reasonable access if you're not living there for viewings. But that's it.
This person sounds really unreasonable and I wouldn't let them do anything to the property until you have surrendered the keys and agreed to deposit release including deductions off the deposit for damage, if any. If they want the property back earlier, I would agree to give them the property back early if they agreed to refund a partial and prorata rental payment.
Please get back to us. There are some people very versed in Lettings, who may be able to help.