I get contacted by representatives of MGI about 1-...

I get contacted by representatives of MGI about 1-3 times per quarter. I keep on asking for MGI to not contact me, yet they still do. I have no idea where they have my contact details from, yet they still contact me. Several requests to delete me from their database have been ignored and I will report MGI for violating the Data Protection Act. Another note: The positions they offer are not even relevant to me and their emails are poorly written templates.