Inquiry not resolved after 2 and half months !!

I logged an inquiry at beginning of January 2016 to discovery card admin regarding my Nandos transactions were not calculated. The investigations starts and I was told that the merchant's trading name are not correct and therefore this has been rectified with the merchant (Nandos blackheath) and my 5 Nandos transactions will be calculated by the system by 22nd of Feb which was my Discovery Card Statement closure date for Feb 2016. After 22nd of Feb, I didn't see the calculations being done, therefore I logged another inquiry to question why this is not calculated and then I received another reply in email from Brandon Sooryalall in Discovery Card admin saying that Discovery Card will manually calculate my nandos cash back for the 5 transactions concerned and I will receive feedback within 3 working days. The inquiry reference number is ***. After 3 working days, I still didn't receive any feedback! Therefore I made call to call centre to escalate this issue on 7th of March and 9th of March respectively and I still have not receive any feedback. I am very disappointed with the Discovery Card services !!!! This issue has taken Discovery 2 and half months already !!