Unable to book online with Momentum discount

Good day,<br> <br> Since Nu Metro has launched their new website, I have had so many difficulties booking tickets online using Momentum discount. Each time I just get the message \We are unable to process your loyalty at this time". Then when will you be able to process it? It has been more than two months since I have had this problem.<br> <br> I sent a complaint via the website about three weeks ago"