Worst Service I have ever received

I placed an order online. It clearly stated that it would take 3 - 7 working days for delivery. It is now day number 10. I have sent e-mails regarding this and today phoned the call center. Holding on the line for 7 minutes I finally got through to a representative of the company. I was then advised that one item on my order is out of stock. I then told the rep that I saw that stock was available at other branches and if it could be arranged for me to pick up the item at one of the other branches. He said its not possible and that they are looking to a new branch that is not listed on the website for stock. I then asked him if I can speak to a supervisor to which he responded that there is no supervisor there. I asked again that he is telling me that in the whole call center there is not one supervisor to which he answered positively. I then asked for his name and he hung-up on me.

Firstly do you have no supervisor available in your call centers? Secondly very unprofessional for your call center to hang up on a customer? Thirdly why is it taking forever for my order to arrive and why if there is stock available at other branches can't you make a plan to go pick up the item and deliver my order?

This is highly unprofessional and I would like a follow-up on who I spoke to as well as the reason for my order being so late. And a ****** apology for your call center being so rude.