Cash Back Problem - Disappointing

On 31 May 2018, I went to clicks to purchase essentials for my home. I was eager to use the R52 on my club card. Once the transaction was rung up, the cash back was deducted from my card. When trying to pay the balance with my credit card, it was swiped twice and I was then told that there was something wrong with the speed point. I was asked to move to another till where the transaction could be redone. On moving to the till, it showed that the R52 that was deducted was on my card but could not be used for the transaction. I then had to pay the full amount after waiting for the manager to resolve the matter with Shenaaz from customer service and Clicks IT. Apparently the matter could not be resolved. I was asked to come in the following day to check that the R52 was still on my card and use the cash back for something else. That is extra time and petrol that Clicks does not consider which ends up amounting to more than the cash back. What is the point of having a reward system if the customer cannot use it when they need it. I am starting to think that this is a ploy by Clicks to get customers to come in again to buy additional items that they do not need. Truly disappointed in the Clicks Cash back rewards system. Perhaps it is better to change where I shop rather than be given false expectations.