Bad Service

on the 8th February, I confirmed, in writing, that my contract ends on the 14th March and that I will not be renewing the contract. i received confirmation. I contacted the new Service Provider and was told that i may not keep my number, as Nashua Mobile still has the number on the contract. I called the help desk and was told that my contract expired today, but that will only cancel the contract on the 27th. i questioned the T&C as this is not stated in the T&C. i was told, this is how we work and we sold your contract to GloCell and there is nothing I can do.