No Response

I escalated a query last week on the 5th regarding the bad service I received from spar staff especially the money market staff.. I received a call last week from a lady advising me that I will receive a feedback in 7days time, Yesterday was the 7th day but I didn't hear anythng from Spar.. Tell me in such cases what do I have to do or who can I speak to couse I can see that no one took my matter serious that is why they are failing even to send me a message apologising or call me....