Vodafone India — After change is plan request still same charge from 3months

Address:

Mumbai City, Maharashtra, 400013

After opting portability from vodaphone to airtel, vodaphone gave me economical plan and i continued with vodaphone.its been 3months they are not changing it and i am getting same bills above 3000rs
In the month of feb i had chosen portability option.vodaphone had caled me up and requested no to do so and they hav given me good plan which i wnted in that total bill will not exceed 1700 rs including taxxes.as i am vodaphone 1999 red plan customer i cannot cahnge my plan through mobail app.
So i executive assured me to change my plan to 1700 rs plan from their end.
Now its been 3months they have neither changed my plan nor my bill got reduce.i hav requested them many time through cal and theough online chat and email.assurance of calling back and solving complaint in 48hours, what i get is only auto responded email only.
Please look ontoo it as they also hav call drop too much and they are charging exrnsivly to customers.