I am a MTNL user from past 5 years and had experienced very worst services by them.
I have taken a plan of unlimited calls and 2 mbps wifi till 40gb and then 512kbps. My phone remains dead for around 15 days in a month due this wifi also dont work. MTNL official dont listen the complaints on time. There server is always down and line remains always disturbed.Only one thing from MTNL side fast that is giving bill. Every month bill comes on time not the service men.The wifi speed never come above 200kbps.
According to me jio is an alternative way and you should switch to jio or Vodafone wifi.