I had big problems here with my Spanish ISP which is owned by British Telecom. Finally sent registered letters to CEO of BT in the United Kingdom. Never had a reply but their threats to take me to court for only giving six months notice that I was cancelling the contract with them ceased immediately.
(I was cancelling the contract because I was switching to WiMax - I live 15kms from the mast and get first rate broadband over the microwave link. Can't think for the life of me why other countries don't use WiMax. Very useful when the phone lines come down in the winter's snow).