Impossible to stop *****ulent activity on my PayPal account.

I have been getting billed on my PayPal by Uber BV despite my not having used Uber in several years. There is no easy way to get this resolved and trying to contact PayPal is a nightmare. I am now sitting and waiting for a security code that PayPal claim to have sent to my mobile but nothing has come through and without it, I cannot close my PayPal account. How do I get rid of this useless PayPal account?