Airtel — about being given less 4g internet data on sim recharge against the promised data

Sir, the company is not providing the spitulated time/days for sim recharged for internet 4g connection under number[protected] as details below:
1. Recharged on 17/10/17, plan rs. 399, 1 gb daily for 70 days but plan closed after 28 days aginst the agreement.
2. Again recharged on 17/11/17, plan rs. 399, 1 gb daily for 70 days but plan closed after 35 days.
Both time it was first promised for 70 days but curtailed earlier.
Is it not a palnned cheating?
Is this the way the company treats its trusted customers?
No concrete and satisficatory answer is given on inquiry.
Please look into the matter at the earliest and add the promise data ncluding the previous one, otherwise i will plan future course of action.
Correspodence can be made at
Raghbir dyal
[protected]