Airtel — kolkata prepaid sim not working in pondicherry

Address:

605001

Ever since i landed in pondicherry my kolkata prepaid sims are not working properly. Sometimes incoming is ok but outgoing is not ok sometimes both are not ok. I can’t change numbers because they are given everywhere.in case of emergency people would not be able to contact me. Customer care here is not interested in helping any prepaid customer from anywhere in india. They insist on taking postpaid connection only then they will help. What is this? Nobody can force me to fulfill his/her company target. As it is anyone from non-tamil speaking background will have problem telling the situation they are facing with their mobile sims. Please help or suggest if i should change my service providers with immediate effect.