1. They say that I'm over utilizing my link , but I've not made any additional load on my link.. Speed test using international speed sites 1pc connected to router  I'm getting less than 1 mbps but they say we use theirs which give 20 Mbps .. Ofcourse we all know this is false

Please check your SLA. An ISP is not responsible for what happens beyond their gateway. They are very right to ask you to use their speed tests which measures your speed guaranteed to their gateway.

Although you still do have a genuine complaint, but use of internet-based speed tests does not help your cause

 
2. I've created a point to point tunnel..  The services on the other side are being accessed with no change in performance almost LAN like speeds .. Now the tunnel connects over the internet since it's  public ip (JTL)  to public ip (safaricom)  

3. Even with slow internet Email should be working okay ..but our client pcs aren't  able to download even a lowsy test 5kb email

I highly suspect they're upto no good.. I'll upgrade and redo all my tests so as to have evidence in future.. But what say yee? 

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