Poor customer service

So I order online for Megaweek. After waiting 40 mins I get a call saying they can't deliver my pizza because they don't deliver in my area. I ask Samantha what must I do now since I'm already waiting for 40 mins and how was I supposed to know which branch I'm ordering from as they don't specify on the website. She apologises and says she's sorry etc. I ask her what must I do now and she says Glengarry branch delivers to us. So I tell her well I know Brackenfell delivers to us since I have ordered numerous times but how was I supposed to know which branch. So I tell her well you could call them and get my order from them since the only reason I ordered online was for Megaweek. And she tells me well she doesn't know their number. At this point I'm already beyond irritated because it's not my fault they don't deliver in my area. Bare in mind Debonairs, Dominos Brackenfell etc all deliver there. So I end up having to collect my order from them. Where is the customer service for someone that orders almost every week. Really disappointed and frustrated.