Hi I'm new to these forums so if I'm lacking any details, please ask away 
Okay. So I've had my GS3 since mid-October , and I've had no problems until almost a month ago. My phone simply will not charge, my dad has the same exact model, and can charge on chargers with no problem, that I cannot, such as a knock off car charger. And whenever I try to charge my phone with the charger that came with my phone(and pretty much any charger), it loses energy instead of charging, all the way down to 0% Even with my RAM running at 0.80GB or less. HOWEVER the only charger that actually works (at a very slow rate) is my old charger for my HTC Inspire 4G. So if anyone could help, I'd really appreciate it!
Extra details: Under warranty, No water damage, no battery bump I think (did the spin test, didn't really spin easily), I noticed with some chargers when I apply some force into it the charging port it will charge for a second or two.

Okay. So I've had my GS3 since mid-October , and I've had no problems until almost a month ago. My phone simply will not charge, my dad has the same exact model, and can charge on chargers with no problem, that I cannot, such as a knock off car charger. And whenever I try to charge my phone with the charger that came with my phone(and pretty much any charger), it loses energy instead of charging, all the way down to 0% Even with my RAM running at 0.80GB or less. HOWEVER the only charger that actually works (at a very slow rate) is my old charger for my HTC Inspire 4G. So if anyone could help, I'd really appreciate it!
Extra details: Under warranty, No water damage, no battery bump I think (did the spin test, didn't really spin easily), I noticed with some chargers when I apply some force into it the charging port it will charge for a second or two.