State Bank Of India — security issue

Address:

Rewa, Madhya Pradesh, 486001

I am using sbi bank account for years now but at current i am facing an issue that the mobile number i registered has been changed automatically with out any intimation to me and while i called to customer care they only making a sorry and continuously asking me to go to my home branch or asking me to register again through online banking while doing with online banking there is no response and was saying that there is some error and i am 1000 km far from my home town so how can i manage to go home as i am having lack of money. Please help me out and reply me this is serious security issue