Payjustnow worst ever no support

I was credited with R2000 payjustnow and decided to go and purchase a few things stood in a long que got to the till and payjust now wants to take the full amount instead of the 3 payments as it offers. I was extremely embarrassed and had to leave my trolly just there and now still I struggle to get hold of payjustnow they have 0 to none customer support chat or call I'm absolutely outraged that they offer there services and do not provide on them I'm still trying to sort it out but they are like shadows nowere to be seen or heard sadly I'm very disappointed with the service I don't recommend them to anyone