Various Betamax voip sites not accepting new accounts/or credit cards

[saren]

Various Betamax voip sites not accepting new accounts/or credit cards

I'm having a strange problem logging in, or setting up new accounts with various VOIP clients.

I've downloaded voipcheap, justvoip, voipraider, voipwise, and smslistto. SMSLISTTO has the cheapest per minute rates to UK mobiles (only 3pence/minute). For this reason, I tried to set-up an account. It blocked me stating unknown problem with registration.

I assume because I've downloaded so many of these clients (which are all betamax products), I've been banned from registrating on anymore. But, how can they know it's me. I've downloaded the different voip from different locations on my laptop. Surely my IP has changed.

My questions are

1) How do i easily change my own IP?
2) Why, after listing Canada as my home location are credit cards not available as a payment option on some of these Betamax voip sites?
3) Has anyone esle downloaded many of these clients and experienced the same problem?

thx