Frustrated client

I've been trying to order a SIM for almost 2 months now, their website keeps timing out when I'm trying to pay the authorisation money. I've tried all my cards; please note the card I initially wanted to use is the card I use for other online payments. I've tried getting hold of them but they take forever to respond and when they finally did, the methods they said I should try to get my payment to work, did not work. So no, I'm not happy.