Samsung Galaxy tablet warranty

My Samsung Galaxy Note 10.1 is under contract with Vodacom and it only expires in November 2015. <br> <br> I'm having problems with the charging of my tablet. Sometimes it does not charge at all. Then I unplug it and when I plug it in again, it charges. But then it only charges up to 21% or maybe 78% ...and only sometimes charges to full. <br> <br> I asked questions on Google to see what the problem might be and to my amazement a LOT of people are battling with the same problem. Seems like it's an ongoing problem with the tablets. I took the tablet to Vodacom to see what the problem is and for them to repair it...as it it still under warranty till the contract expires.<br> <br> They phoned met to say that I have to pay R800 and something for the repairs. When I asked why, seeing that it is still under warranty, I was told that the USB cable and the charger box need to be replaced as it was DAMAGED! My word, I don't let anybody else even touch my tablet and why on earth would I damage it? I don't even know how. All I ever do is plug it in to let in charge. I even have a special place where I store my charger so that it will be safe.<br> <br> What does WARRANTY mean then? AAARGGGG!!!!!!