If net neutrality is supposed to prevent paying for a superior level of service from the provider you directly contract with, somebody should crack down on all the internet providers that offer different bandwidth/priority for different prices.

There’s not an analogue in this instance for the two sides of a network connection; DHL picks up the packages and drops them off. If you want to argue against price discrimination in general, you’re going to need a stronger argument than an analogy to net neutrality.