Taxify's card billing system is useless and has bad customer service

In all honesty, I think the way taxify does its billing via cards is very unprofessional and shady. I requested a taxify and at the end of the trip the taxi driver's machine supposedly froze and my trip was not ended. Owing to this I was overcharged. Upon making a complaint I was told I would get my refund within 3 days. How can you overcharge me then not reverse my funds immediately? I am so not happy with the level of service from taxify and what makes matters worse there is no clear communication lines apart from email. This is not good customer service response.