Bad service received from MRP

I am writing this review with great disappointment (bad service) I received at Mr Price (Menlyn Mall branch). As a staunch customer for this particular store I received an SMS dated: 24/07/2021 which was confirming that I have been awarded R180 voucher which I could claim when buying through my account on my next purchase. It indicated that offer ends: 24/08/2021 and the voucher number given is: ***. I went to this particular branch hoping to claim my offer but my surprise I was shocked when I was told this is no longer valid. This was related by Supervisor (Desmond) after consulting with his superiors.

My issues here are if that info was true why do n't they sent same messages to inform clients about that decision? Why I was never told at the counter where I was claiming (meaning their cashiers are not aware of that info) - Palesa . Why a Supervisor did not tell me right away in that space that this is no longer valid? Why did he had to go at the back / managers office to verify that info (Was he not informed about this decision). I took my time to visit this store for this claim and this made me a fool in front of their staff as I did n't have courage to argue at that time because I did n't have enough time. I demand my voucher and apology from this store as this was disrespectable lying to me like that. I definately have a feeling that I am being ******. As Hello Peter always help in such instances, I would like you to help in making sure that what I get what I deserve.