Check your contract, what does that say, OTE, reasonable notice of shift changes etc,
If not you're ion trouble.
Talk to the manager first if no good, speak with your counterparts, a united front is the only way to sort something in a small outport. What does head office say.
Failing all that join the ALAE if in th UK and you WILL get legal help,
http://www.lae.mcmail.com