Airtel — [protected]- net is not connecting during 6pm to 11am every night

Address:

Bagnan,Howrah, West Bengal, Howrah, West Bengal, 711303

Respected sir/madam
Airtel 4g service is become slower day by day. I am experiencing no net connection from 6pm to 11am every night, in my Airtel SIM, [protected] inserted in Asus ZenFone Max Pro M1 (6gb/64gb).
This seemed to be regular practice by this company to fool me. When I lodged complaints here, Airtel increase the speed for a week. After then they reduce the speed.
PLSE take fast action against this mischief.
Regards
Sadia