Uber Credit Card ****

I have been using the App with great success in the past. However, I noticed a large bumber of Debits on my Credit Card when I had not utilised the service. When contacted, Uber maintains an adfitional party was added to my Profile , this without my knowledge or permission! The Card security is thus scary and there is no ***** detection from their side. All the amounts were not of a regular nature and gor a number of small amounts, R10, R74 R5 etc! I tried to request that ******** Charges be laid but suddenly Uber do not respond any longer. The charges have not been reversed. I cancelled my Card and will not leave myself open to their lack of Security ir Communication.