Need some help

I traveled to another state on 25th January, After returning, my 4G VoLTE shows no network, emergency calls only, though it worked fine there. but since I came back H+ is working and the internet speed 30-40kbps. but 3G is not working fine that is used to be before 4G the 3G internet keeps turning on/off, there is no network issue in my area.

I tried to complaint it on bsnl selfcare app but it keep showing there is technical issue please try again later since yesterday, then I tried coustomer care and the recorded voicemail says your called is transferred to our agent please stay on line and then the call ends.

What should I do..?