Contract changes without informing the customer

Vox contract included 100 local voice minutes. The company decided to do away with this without informing the customer. We were just left with a dead telephone line. We contacted Vox Help Line, Customer Service, Technical Support only to be told that it looks as my phone is broken. Now after two weeks trying to sort this out did a technician from Vox tell us the truth. We find this an impossible behaviour and are more that upset. I am not surprised that Vox has more negative reviews than anything else. Just changing a contract without notifying or us agreeing to it is in my opinion illigal. Just evebody be aware of this company - THEY ARE NO GOOD.