Bought a Mi Note 10 from Official Xiaomi Lazada st...

Bought a Mi Note 10 from Official Xiaomi Lazada store. Received a softcopy redemption voucher for Redmi 7a. Went down to Funan outlet, but they only allow claim with physical copy which was not sent to me. Highlighted by the staff there that they can't do anything although it was bought via official online store. I can only email Xiaomi to sort this out. Totally wasted my time and money to go there.