Reliance Bigtv — reliance big tv dth service not available

Reliance big tv dth service not available since 29.01.2018. It shows error code 400. I tried to contact the customer care centre in the number shown on tv screen[protected]. But it gives only engaged tone. Searched and found two other numbers[protected] and[protected] from their site. But these two also always gave engaged tone only. Also sent a mail to their id, no reply. (Smart card number[protected]