Airtel — not able to recharge my airtel no. from online or apps

Address:

560095

Im not able to recharge my airtel no. Since 2 months from online on their website and also from apps like airtel (Their own) or paytm or amazon pay. I migrated from postpaid to prepaid. Since then i can't recharge. I can only recharge from airtel store but i don't find time to go always because of my office (What in the case of emergency?) and why do airtel cant provide free of charge to call customer care. What is the logic when i can't able to recharge and having no balance how can i call them. No doubt, they wantedly doing so that i go back to post paid. It's better to port my no. To other network. Lodged complaint almost 20 times but no use.