Why Is It Hard To Cancel A "Pending Order"?

I don’t have social media, but I’m also not sure how that would be any more helpful when I spoke to multiple Customer Care people on the phone and they said their system itself wouldn’t let them cancel the order.  The last person I spoke to said that the cancel button was greyed out and he couldn’t click it (which doesn’t make sense as my payment apparently wasn’t even processed until like midnight last night, so there should have been time to prevent the payment from even going through.)

Overall the experience with T-mobile yesterday was not good and I am disheartened that a delivery person will unnecessarily be on the road wasting everyone’s time and energy to deliver an item that I have been told I need to refuse delivery of in order to cancel my order.  Seems like a very impractical method for handling the situation, but that was what I was told to do by a T-mobile employee after three other T-mobile employees told me that they couldn’t handle anything on their end.  This company clearly doesn’t have environmental concerns included in their business practices.

This also doesn’t even include the faff of trying to speak to a person when I’m part of a family plan and apparently only the lead name on the plan is allowed to talk about the plan.  This part was excruciating considering I was a T-Mobile customer years before the rest of my family switched over and now I have no control over my own phone service?