Angel Broking — Not getting vouchers

Angel broking has their scheme, if you refer a friend then you will get a voucher worth 500 rs. I have referred my two friends and opened their account through a broker and he assured me of getting vouchers but it has been three months now I didn't get even a single voucher . I have talked to my broker about not getting a voucher but he didn't take any action just told me he mailed my details but still my issue is not solved.
My client id: S275905
Referrals :S373167, Y2204