Airtel — delay in bill generation

Address:

Khammam, Andhra Pradesh, 507111

Since last 2 months bill genaration getting delay, usually my bill will be genarated on evey month 7th.
Last month when i contact customer care executive for almost 5-6 time to get my bill.
Thats why i went to migrate to prepaid, there also when ever i asked "it will take 24 more hours sir" they replied. I submitted my documents for migration on 22nd august.
My postpaid numbers are
[protected] & [protected]