My question involves labor and employment law for the state of: MN

I received a relocation package in Dec 2010 for moving from Las Vegas, NV to Dallas, TX. My company is based out of Minnesota so I think MN laws apply here. I ELECTRONICALLY signed an agreement to pay back a relocation package of 10,000 if I am to resign within 24 months of that Dec 2010 date. No surprise here but I resigned in April 2012.

My ex-employer sent me a documents asking me to return that full $10,000. The documents involve a letter stating the amount I owe, the relocation agreement, and a letter of acknowledgement that I received this. The relocation agreement has only my name on it and a SUBMIT Button. It was an electronic signature so other than a mouse click, there really is no record in ink that I signed this.

My question is Does my ex-employer have enough evidence to go after me and ask for the money? Should I even sign this letter of acknowledgement? As a side note, I am moving OUT of the country and working elsewhere. Do the legal ramifications have any effect if I'm somewhere overseas?

Thanks,