Recently active topics in Rebtel

I was a user of Gorilla mobile which is now out of business. The company recommended Rebtel for an alternative. I tried free 5 minute call sucessfully using my landline. However, I could not make a call using the same landline after i made credit deposit. I failed to register my landline number. When I tried to register it, I got a respnse "The phone number is alreday in use".
What can I do to register the landline to use Rebtel?

When I call a friend from my contact list, a voice tells me "Please wait while we connect your call", some beeps and then the call is hung up exactly after 3 seconds. I'm calling from Finland to Sweden, and ofcourse, the call-time is deducted from my account-balance..

I am having trouble connecting with my friend in Germany. They see me calling and pick up and 1/2 the time get a Polish/Russian??? person speaking and when they try to call back for a smart call the same thing happens. When they try to call me directly and me call them back it happens too. Obviously some lines are mixed up here and it has been going on for 2 days now. Please advise.

Even though I registred my friend myself through the email link Rebet provided through my friend email, Rebet reply insist that the reqistration was not done through the link and refuse to pay the credit. I highly recommend anyone not to use refer a friend program or look for any credit from Rebel as they are not able to invistage any problem in their system

I have never been able to make phone calls to Zambia on either a landline or cellphone for the last 6 months.