The Lebara Mobile contact page, is very bad as well... 
Lets take a few examples: 
Out of the UK
If calling from abroad, please ring:
+44 (0207) 031-0791  Good Luck ringing that number from outside the UK.... it won't work... it should be +44 20 7031 0791 (which IS the format further down).
Now lets look at the 0870 number which appears 3 times on that page: 
Customer services from a fixed line or other mobile phones - 0870 075 5588 - Standard service provider rates - No they don't.. it's 2p per minute plus the access charge as noted elsewhere on that page! 
And lastly: 
Voicemail from a fixed line      +447836121121. Calls charged at your service providers national rate .... How did they work that one out?  Surely it's charged at a rate set by your landline provider?  

Not only am I raising a complaint regarding the continued use of the 0870 number but also about their conflicting information!  
