Makro - ********* experience

On 23 November 2018, I went to Makro Silverlakes to purchase Castrol motor oil. As soon as I entered the store, I went to the customer care counter to find out if I would get a 10% discount on this product if I used the mcard app. This discount was advertised on their " Black 5 Day" brochure on non promotional products. The person that assisted me confirmed that I would get the discount as long as I used my mcard. I collected the motor oil and proceeded to the cashier. I also asked the cashier if I would get the 10% discount. The cashier was unsure if I would get the discount, but she however called a supervisor to assist. The supervisor told me that I would get a discount, but it would only reflect on the mcard app after 24 hours. Based on the information given to me by two Makro staff members, I made my purchase of three cans of motor oil. On 26 November 2018 (three days later), I checked if my 10% discount was allocated to my mcard app. No discount was allocated on my mcard. My mcard number is ********** 6. I wonder if this was just a marketing **** to get customers into the store, or whether it is an error on their mcard app. Nonetheless, whatever the reason may be , it is a very disappointing situation. I for one will no longer be shopping at a Makro store, as I made the relevant query prior to my purchase, and what I was told did not materialize. I view it as an ********* experience.