Vistara — Our complimentary voucher - they withdraw

Address:

delhi

Your query on query number 249690.
Our complimentary voucher - two voucher issued after 2 month they remove one voucher, after several follow up they keep saying we are checking we checking we will update shortly.
24, 48, Bla bla. never response back, after several ping they response after three month later " please note that voucher was erroneously credited in your CV account and hence the same is not visible in your CV account"

so basically they make fools to customer to try to avoids,
could you please take action on that,