Absolutely useless customer service!

I ordered some parts from RS Components and for whatever reason this is the courier service of their choice, I missed the delivery initially because I left the office after hours, When they got here i never recieved a call saying that i missed the delivery when i live down the road from my office, would have been easy if they just called.

Fast forward to this morning, I see a notification that the delivery was missed. So I try to call customer support but the number reportedly "does not exist", I've emailed them, no response and I've even tweeted at them and no response. the level of incompetence is astounding!