lying to customers

Good day

i'm not sure when was it when i opened this account i think two months ago i met this Sale representatives at checkers Brackenfell Her name was Zanele or Zandile works for FNB Brackenfell they had a promotion that when you open an easy account you get R200 Checkers gift voucher still today i'm waiting for that voucher. after a week i opened the account i contacted the bank spoke to the girl which i'm not sure whether her name was Zandile or Zanele but i spoke to her she said she will load it im will receive an sms the day passed she called me again saying the was a problem on their side and none of the people that opened an account had received their voucher she stated that she will call me back for more info its been two months now i'm still waiting. my complain is that if your Sale representatives are gonna lie to clients just because their wanna make sales they will end up making customer use another bank or is that FNB policy you say anything to a client as long as you make sale this is not right you can't promise clients about something and they when they expecting it you come up with a lot stories, that's not fair. will kindly wait for response

thank you