Under normal conditions this should not happen, what kind of pings do you get normally and with WoW Tunnels?
Is the increased ping constant or does it happen in spikes? What WoW server do you play on and which WoW Tunnels server did you try / used?
We do mention that this service _may_ not work for everyone. There are certain instances where WoW Tunnels may not help decrease ping at all, noted in the FAQs
http://www.wowtunnels.com/faqs#q3Most of the time this is due to poor international bandwidth or unstable connections.
The capacity has been increased by more than twice the capacity since the original price without any raises so far until this one, I don't see how you can say the price has risen without increased capacity or an improved service just based on your account alone.
If you're unhappy or it is not working out for you, you can always request a refund by using the contact button on the main site. We're not here to rip you off your money.