Worst customer service

Worst customer service ever in my entire experience at retail. Had discount voucher which wasn't redeemed at the store despite advising the cashier about it, immediately reached out to truworths on social and only responded after a week, I then opted to email was only responded after a week still with questions despite me providing those details on my initial email, to date it's 20 days of back and forth, no resolution to my query. Am gutted in the service rendered by this company and won't encourage anyone to be lured by the promotional vouchers promised when opening the account. I now regret it. This and many other queries just shows lack of leadership and responsibility in this company's management, and lack of insight. You can't have queries opened for that long with no feedback.