They are rationilising the tower tendencies across the country and areas with less subscribers will have the towers removed completely. Vodafone Idea is facing a severe cash crunch, so at this point it is better if u are facing poor network that you port out to Airtel or Jio whichever has better coverage in your area.
If there is a network problem then twitter complaint in worth giving a shot. If the coverage is due to the lack of tower then they won't do anything at this point. They are in cash conservation mode and if you are from there "not-much-return" circle such as C grade circles like Bihar, J&K, etc then it will be even worse.