UPS Delivery Driver...

I am disabled (right leg amputee with severe circulation and nerve problems in the other leg), and am usually in a wheelchair. My ramp is at my back door, and mail and packages are delivered to my front door. Because I order online often (it is easier than trying to get out and about and carry things in my wheelchair), I frequently depend on UPS, FedEx and the USPS to deliver my packages. When UPS delivers, they invariably chuck the package directly in front of the screen door, so that I can barely push the door open to get to the package. When I do push the door open, the package is shoved across the porch, and usually ends up falling down off the front steps, which means I either have to ask one of the neighbors if they will lift it back up to the porch for me, or I have to put on my artificial leg and try to climb down the steps to get the package. Since my balance is terrible and my legs don't work so well, this is a risky little proposition for me. The delivery driver always knocks on the door as he chucks down the package, but does not actually wait the ten seconds it would take me to answer the door, even while I am yelling "I'm on my way! I'm in a wheelchair!" Last time, I left a note on the door explaining that I am in a wheelchair and to please allow me to open the door to get the package, and even left the front door open so he could see through the screen door and see that I was in a wheelchair, and as I said, "I'm on my way! I'm in a wheelchair!" He yelled "UPS! Have a nice day!" as he trotted away. Now, I understand that UPS drivers are busy and have a tight schedule, but are they really that rushed that they would ignore a large note, an open door, and the crippled lady in the wheelchair asking them to let her get the door as she is rolling across the room to get the door? Or am I being unreasonable in expecting them to wait the odd seven to ten seconds so that I can get to the door to get my package from them? And, no, I don't think of myself as a "special snowflake" that is demanding preferential treatment. I think of myself as a disabled person that is just asking for a little consideration in regard to being able to get my package without having to risk my safety.