Hi there and thank you for your question,
I will try to assist you with your legal question but please feel free to ask as many follow up questions as you like until you are 100% satisfied.
If you are the registered owner of the immovable property, then there is no reason why the estate manager should be allowed to enter your property without your knowledge and consent. You should tell him that he is trespassing, and demand that he never goes onto your property again. If he does, you are within your rights to call the police and have him arrested for trespassing. You can also complain to the Home Owners Association and explain that you don't want the estate manager on your property.
Regarding the forms, I'm afraid that it is normally part of the Estate's rules that you complete that information. It normally forms part of the security of the estate and access control. If you don't like it, then you mustn't buy in the estate. It has, in the past, held to be a valid invasion of your privacy since it is done in order to protect the general population of the estate.
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Good luck and best regards,