H&M Western (INDIA) Private Limited - Never got my vouchers worth

I was promises voucher worth *k by H&M india if i spend *k above i made * purchases worth *k each they kept on giving me dates one of the advisor told me that there is an issue goin on globally and you will receive your vouchers by **th November now this people are denying to give me my vouchers and blaming me that i dint visited the store to complaint about the same if customer has to suffer why they customers care where they give fake commitment now they are denying me for my rights for whoch i paid my hard earned money they are harrasing me for this now they want me keep on writing email go here and there and make me loose my patience i want my right as customer i will not let them scam me i have proof of purchase and email trails where you can literally see they are denying to give me my rights