Tenant not paying rent in Spanish property.

[Pexus1976]

Hello,

I have a Spanish property, we took on tenants early this year, they paid 3 months rent but are now in arrears of nearly 4 months. I've spoken to them a number of times and they keep coming back with excuses, at first they seemed genuine. Unsure now.

They have signed a contract and we have a copy of their photo ID.

What are our options if they decide not to pay the arrears? All suggestions very welcome, as this is extremely frustrating. Thanks.