SECOND PHONE NOT WORKING

I ordered a Microsoft Lumia telephonically from Vodacom. It had to be returned as it restarted continuously during the day. I had to wait 10 days before getting a new phone, a LG Leon. Now after 3 weeks this phone is dying on me after 3 to 5 minutes. It also shows that the original battery is not in the phone. This is the battery which came with the phone originally. 3 different sim cards where tried so the problem is definitely lying with the phone. Tired of phones supp**** by Vodacom not working. How long do I have to sit without a phone now????