Brand new mobi cell tablet - faulty

I would like to raise the following complaint. I bought a Mobi cell Cosmo tablet on 30 October 2017. A few days later after charging the tablet, the device could not switch on. I booked the device for investigation on 15/11/2017. The store which I purchased the device at, Woolworths Adderley Street received the device back almost 3 weeks later from the repair centre. I collected the device on 07 December(last week) and on Sunday passed yet, the same problem happened- the device would not go on after charging it.

I am extremely frustrated- as I have hardly used the device and yet again- it’s not working. I do not want to book it in again because I will probably wait even longer to receive it back this time.

This was a birthday gift to my 8 year old son. I take the time to download all his favourite apps etc. only to have to redo it again. This is no longer a gift to him but rather a problem.

I am not a satisfied customer and I need to know how you will assist me in resolving this problem.

The IMEI ********** ********** 7. At this point, I seriously have no confidence in the product and prefer to either have an upgrade or my money refunded.