Uber Eat Customer Care sucks!

I had a Uber eats account and bought a few stuff through them already. I am being charged R50 each month for free delivery. I sent them numerous emails explaining to them that I have changed my cell number and everytime i want to logg on the code gets sent to my old cell number. They dont respond to any of my emails...so I'm basically paying for a service that I'm not using!!! UBER GET BACK TO ME PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!