Poor customer care service

On two occasions I received promo codes, when attempting to redeem on the MRD app, I received a pop up message stating the coupons had reached their limit, however on the app it shows no limits, when attempting to contact MRD CUSTOMER CARE, you receive no response you hold on for hours to speak to a call centre agent, no response on emails either, I had an issue in December as well till date still positive response from MrD or the restaurant. Poor service from the MRD Service center. Time to reconsider using the MRD Delivery service and move over to another delivery service.