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Good Day

I upgraded my contract a few months ago for a laptop and 5gigs of data for my son to be able to study from home, after a few days of using the laptop it wouldn't charge and we returned the laptop. We reapp**** for the upgrade end of August and 2 days ago we received the new laptop but this time it wouldn't switch on even though we charged it for a few hours. I've called numerous times to no help. He has to resume schools and I am back to work fulltime so we need the laptop. Please help.