Labour Party's Reading Skills

I just got a call from a member of the Labour Party. I suppose they got my details from the Electoral Register. If so, said register clearly specifies that I am a French citizen. Therefore, asking me what party I was planning to vote for at the next General Election was quite senseless as I cannot vote for General Elections. Someone should teach the members of the Labour Party (and the others) basic skills like reading, that would save them quite a few phone calls.