Uber India — coupon codes

Its been a long i am an user o[censored]ber and i oftenly get discounts or coupon codes via msg to get 50% discount for next 10 rides on uber go and i did availed in my past those were working properly but nowdays when i am getting same msgs read get 50% discount with mentioned voucher code i am not able to apply it, it shows this code is not valid, your respective executives replies to my complaibts that vouchers are not for your account, i want to confirm if these coupon codes are not meant for me or my account why i am getting them, i wanted this issue to be resolved asap.