Bharat Sanchar Nigam [BSNL] — deactivating bt onmobl service

I tried to deactivate the bt onmobl cricket services of bsnl in all the ways they provided in their websites and their customer services. This is too annoying. While calling me callers gets cricket commentary like voices some of them got confused and refused to contact me. I lost some of the important calls due to this. They are sending more than 10 messages daily. I want to stop this service.