Have you subscribed to "Do Not Disturb"? Actually I experienced similar situation as yours where I did not get any SMS or calls. I did not face disconnection but a rude experience and was later told that it was due to DND.
This is how it happened to me. I got a call from some Jat type guy (you know that weird and rude accent) and he was like..."Apna naam aur address batao" (those were his exact opening words). I mean WTH man? I asked him who he was and what he was talking about. Then he told me that he was calling from Hutch and he needs to do verification. I said that I will not tell any random guy my details and then he threatened me that if I don't tell him details...I should be ready to face repercussions and my connection will be deactivated within 3 days.
I didn't tell him details and asked him to disconnect the connection but I did call Hutch Care immediately. The experience was terrible...the customer care executive was not friendly either and told me that they are giving so many advertisements...this and that. My details were also wrong in their database. Anyways, I went to a Hutch Teleshop next day and submitted the documents but I also wrote to their Nodal officer. Then I got calls from them asking for apologies and all. That it will never happen again...and they will even talk to the agency from which I got the call. After that I even got a call from that verification agency...the people who were threatening to disconnect the connection. They also apologized and said that they will look how their executives talk. It is all fine now...my address and name has been updated. Everything fine
Oh and btw...my connection is also 5 years old and it was purchased from a Hutch shop. Not the normal mobile shops and yet my details in their records was wrong. I guess this is why the whole verification drive is going on because people didn't work as expected sometime back.