I have access to airtel, act broadband, jio fiber, bsnl and earlier hathway and I have switched between them and no one cut my cable and gave me grief ... no mafia present in our and the surrounding areas. Ofc the kinda ppl you talk abt may be there, but we shld not generalize.
This is India. If people are informally reporting corruption in some institution, you'll be on the right track if you believe it to be true. There will never be any formal studies of such cartels. Journalists who attempt to report on such things are regularly murdered. Most people are simply oblivious. You saw in the main e-waste story how the journalist seemed oblivious to the cartel in front of his eyes. If you stay in an independent house, not a flat, you might want to look into cartels of water tankers too.