HP does not honour to repair or replace

I bought a HP tablet 10 months ago. It went in for a problem with it not charging. After 4 weeks came back and worked for a few days and did the same. Then went back in for another 4 weeks and told its working. Now it wont even switch on upon receiving it back! Ensure HP agents do not even bother to come back after informing them it wont even switch on. Been three weeks now, several emails and lots of phone calls and now with a broken table for 10 weeks now. Contact HP direct. Now waiting on feedback from HP national and then HP international, or so I am told. This is shocking. They are not honouring the guarantee or so much so even bother to communicate via email,. phone or any other method. Now told I must wait a few more weeks for what will take place.. Then I will have to either wait for a comment to repair or replace (if so) and then wait until that is concluded...Shocking service, This is the last HP product I will buy, and I bought 3 of these tablets and a laptop. I want to know what HP is going to do about this.... I want some action and NOW!!!!!