Refunding Money

Bought a AG Mobile Tablet June 2015 from Edgars Kenilworth Centre which was a bad manufacture and gave in September. 2015 and was replaced by AG Mobile beginning October 2015. The new one worked for a week and that too gave in and would not charge, I then went back to Edgars complaining that I didn't want another AG Mobile tablet as I. Was very unhappy and would like them to replace it with a Cellphone or another Tablet or a refund. The assistant at Edgars got onto AG Mobille and put in my request and was told that there is no other replacement for this product and they cannot replace it with another Tablet and will take it in and I have to wait another 21 days for it to be repaired. That would of been ok if I had time.. But I am due to leave for Australia the 1 November for 3 months and don't have that kind of time. Edgars has still to respond to me regarding what they are going to do.. In the meantime the clock is ticking.. And I don't know what to do.. I still have the useless tablet in my position which I paid 1899.00 for. Very unhappy