No Customer Service Response

Hi. I've been trying for the last four days to get a response out of taxify, but nothing has come.

Last week I requested a ride as I would usually do. Upon the trip ending, I received an email to say that my card could not be billed and that I should add another card so that they can complete the transaction. They also blocked my account after this. Firstly, there is nothing wrong with the card. It's worked many many times in the past and also works with Uber. Secondly, if they had issues with that one, I have a second card loaded on my app which they can use, but they did not. Instead, they asked me to add another one (which if they'd check is already there). A simple solution of billing the other card exists, but clearly they can't think far enough. This little glitch happened once before and they retried billing my card and everything worked out. I received a confirmation email stating that the card was billed, I could continue using the app and that that particular card was fine and could be used as it was many times in the past. I myself questioned whether or not the card type was not compatible with the app or something, but they assured me that I could use it. So I did. Now they refuse to reply to any of my mail asking them to resolve this issue. The app has been blocked for four days now...going on five... Who knows if anything positive will happen. And they claim to "typically respond in one day". Mayne if I'm lucky, they will respond to this.