UBER EATS DEDUCTING MONEY WITHOUT MY KNOWLEDGE

I have had the Uber Eats app for a long time, we sometimes do order food through Uber eats. It was quiet a shock yesterday when I noticed that Uber eats are deducting money from my credit card account. Deductions being, Uber Shopper Statement R10.00 (what???? why would I need a statement for ordering food on line??), Uber SA help JHB R1.00 (who am I helping?? Surely it must be my choice of whom I want to help??), UberSA 2 EATS Help.uber R10.00 (Yet again, what or whom am I helping???). Today an even bigger shock when I tried calling them and you can't, as they have no number in our area yet. Who authorised these deductions??? It is not a big amount but to deduct money from my account without my knowledge is making me furious!! This is a big company in South Africa and if they are taking R21 per month from 500 people it will add up to R10 500 p/m. I have trusted that my credit card details would be safe with them, but now they have misused my trust by deducting money from my account without my knowledge. How I am supposed to stop this?