samsung tab 4 contract

My husband got me a samsung tab 4 10 ince on contract middle last year. Sice then i could not have have ussage of more than 20 hours because of batery problems. My husband told my to take the tab to vodacom middelburg mall where he did the contract. My error report: short batery life,not charging to 100% and overheating warnings. After about a week i received it back and the next day i took it back again because the problem was worse nou. After charging 7 hours got stuck on 89% only and after 36 min it died again. Why the hell did witbank send it back if it is worse nou? So after about yet another week i went to collect again from middelb mall. This time the friendly lady told me she had send it back again to witbank because it somehow got damaged. I was upset and told her i want a new tab. Now i waited much longer as they were waiting for spares. Got it back yesterday. It does not even start up. Only the galaxy tab 4 logo flickering like mad and then it restarts again nothing else. Vodacom you owe me a new tab 4! What is wrong with the tech in witbank? Why sending it to the customer if it is even worse. Is there no quality check???!!! You are braking contract. I have now no usage!