Well a contract is a contract, sorry to say, and I don't think you would have liked it if they had said they were cutting you off mid contract because they were all going on holiday .... it works both ways. I did the same thing recently and just let it run, I think you just need to pay it and chalk it up to one of the expenses of leaving the country. Have you asked them if you can convert it to pay as you go, you probably have not had it long enough, so apart from that there is not much you can do.