Who called from 31507

I received 2 calls on different days from +31507, the first call i told the guy i have never filled in any internet forms with my details and to removed my details from their database! The second call i received today said the same as the first guy so i just let rip on this agent!! I asked what the company name was and the women refused to provide this which in my opinion is unprofessional for a British company.... Hang on it wasn't British, it was India as per usual!!!

Anyone know who these are as my fathers lawyer first will be taking this further???

Keep getting calls from +31507. I dont answer as number looks weird. Anyone any idea who this is?

i just received +31507 call today and i am wandering who this is. who ever it was didn't answer the phone...any idea would this can be...

hi i keep getting called from +31507 and when i didn't answer they tried again using +31966, haven't got a clue who they are or where they got my number from...

Just had a call from this number. I'm presuming it's a result of me completing a survey.