I rented my spanish property to commence october through an agency (English) in Alhaurin Spain.
The person who signed the contract is not the one who is residing in the property. I recieved two months deposit and 1 months rent. My 1st payment of rent was due 26th november - I have recived nothing to date.
The agency assured me before I left for the UK that failure of payment by the tenant I quote "he would be given 5 days notice after the due date then he will be evicted".
I have since been in touch with the agency and they are saying there is nothing they can do although they have recieved 1400 euros to set the agreement up.
This unknown person is saying to the agent that he will call into the office to pay the rent, then he rings and says he's handing the keys back, then he is asking if he can pay next week. I am confused as to why the agent is dealing with this person who has nothing to do with the contract

My questions are: -
Can I ask this person to leave?
Can I go back to my property to live in it?
Will the police help me?
Can I turn the utilities off?
Can I authorise someone to change the locks?

I would dearly appreciate any bit of help/advice you can assist me with