I would advise the opposite. Disconnect only when you have your new connection working. You never know what snags might come up and you might not get a connection from airtel for whatever reason. Then you have to pay Spectra again for installation and deal with headaches.Yeah.
my plan is to talk to airtel and confirm if they have the plan that I want.
after that I plan to request spectra disconnection sometime next week.
Il only request Airtel installation after spectra is officially disconnected even if that means living without broadband for a few days