Further to what Hiral Mehta mentioned, please note that 'going legal' is NOT the solution for every HR problem. In fact, many times such a step only DEEPENS or AGGRAVATES the problem and the consequent finding of a mutually viable solution. While you mentioned your view of the reasons, the management's views CAN be different.
Understanding Your Situation
Coming to your actual situation, you haven't mentioned WHY you don't wish to move to the new location. Are there any official reasons, or are they only personal? In general, it's always wise to handle such situations amicably. The more realistic solution for a worst-case scenario would be to change the job rather than going legal, especially where there are NO monetary or long-term issues involved.
All the best.
Regards,
TS