Uber Eats free delivery pass

I signed up to the Eats pass and was charged with R50 after the free/trial period. I had forgotten to cancel it as i hardly use uber eats, except when i traveling for work. The uber eats pass gives you free delivery on all orders over R80. All this time they have still been charging me delivery fees every time i ordered and yet they still took off R50 to sign up for free delivery. I tried to contact them, but it says the number is not in service. I tried to follow the instructions on the help icon, on how to cancel it, yet it doesn't work, now i see a further R50 has been deducted off my salary. how do i get hold of them to refund my money and cancel this uber eats pass so that i can delete this app and never order from them again.