Dear Frankkt,
That is a bad situation.
What is written in the contract? is it signed by both of you? Did you have it certified by a notary?
If not, and he has not showed his immovable's certificate, then you're in a big problem, as he might be not the owner.
A lot of the questions that you have are related to the contract, but if it is not certified by the notary, there is not much you can do.
I would recommend looking at your contract and if signed by both you have a slight chance, if certified by a notary then you have the full rights according to your contract.
I would also change your apartment (landlord) as it is very shady business that he is doing.
Best regards
Nyamka I