Relocation Expenses Reimbursement

I am an outside sales rep for a software company in Northern California. I was in a good position in So Cal and was recruited out to the present position. I was hired by one of the parent company's business units with a specific description of the opportunity. The new employer re-located me to the Bay area one month after starting with a relocation package for expenses. There is a provision if I left the company within one year I would have to pay it back. Shortly after re-locating, the parent company re-defined the sales model and changed my responsibilities. The change is so drastic, I would have never left my old company.

My question is:

Do I have to repay the relocation money? My position is they defaulted on their end and made a conscious business decision to move in another direction and I should not be made responsible.