Optimus G issues

I'm having issues with my Optimus G. I can not down load or update apps. I get an error message (packing file is invalid) Been on phone with technicial support for 2 days. Tried all the trouble shooting steps. Factory reset, hard reset, clearing cash, removong updates etc. Ruby, the technician said after all the troubleshooting she can do nothing more. 

The phone is less than 30 days old I paid full retail for it. I know i'm past my 14 day period but, i'm stuck with a phone I can't use.  I have no other option but to purchase another phone at full retail.. unless I can get some sort of discount... I really need a phone today..

I knew I should of stayed with iPhone!