Airtel — after recharge and confirmation they change the plan

Address: Bhagalpur, Bihar, 812001

Website: www.bh.pathlegal.com/Notary-Attorneys-Airtel--

Hi i get offer by airtel recharge with 399 for 84 days.
After recharge confirmation sms come with same as they offered.
But within 2 minutes they send another sms and reduce the from 84 to 70.
I called them they confirmed this is server problem you 84 days because you get 84 days offer
Now after 70 days they change plan and cut my 14 days without any information
I am also attaching all related sms screen shots.
I don't want 14 days but they are layer someone give punishment for this type of cheating.
Also they cheating in data balance consumer using 300mb and they cut 700mb