New customer, can't even activate because SMS doesn't work??

I have recieved my new SIM today, but I can't actually do anything with it as all the activation options use an inbound SMS for verification, and it appears that inbound SMS is broken on Lebara... How do I activate my SIM??
I've been waiting for support (chat) to respond for an hour now and nothing is happening - should I just sack this off as a sign of things to come and cancel before I even begin lol?