Free ride promo code

Taxify sent me a promo code for R90 off my next 3 rides because I haven't been using the app for a while decided to use the promo requested that was R20-R25 and R100 got deducted in my bank account, been trying to get a response for the past 3 days but there's no response from any their twitter page Facebook and support from the app. They are ******** people with promo codes that do not work unless they charge you more than the trip