Very disappointed at 'Promotion' advertised, when in fact you are charged for it

I've settled my account, and prior to settling, i received an email offering me a promotional R100 "to spend" at Clicks... so this came across as a voucher for me to spend.

only to find out that after I'd settled the account, i was actually charged that R100, plus there are admin fees attached.... and now no-one can respond to me as to what i still owe, and I'm horrified, as I would NOT have frivolously spent that R100 at Clicks if I was paying for it. I am very careful with my finances and cannot afford to spend on luxuries right now.

this serves as a warning to others who think they're getting a "free" R100 to buy at Clicks.

Here is the email they send you:

Good day, I hope this email finds you well. We want to remind you of the R150 promo that you have available on your account to use at Clicks. You will get up to R150 OFF at Clicks when you use your MediWallet card to pay, plus 10% BACK in MediWallet points that you can accumulate and use as a discount towards future spends. If you have not received a MediWallet card you can kindly visit any Specsavers or Execuspecs store with your original I.D or a valid drivers license, they will then link and activate a MediWallet card for you. You do not have to spend a certain amount to make use of your promo but please do note that if you exceed the R150 the balance will come from your available credit. This promotion is valid until 30 November 2024. Ts&Cs.