refusal of service

I purchased a BlackBerry leap from this store on the 4th of Feb 2016. It clearly states that the phone has a 6 month warranty. The phone has a problem with the software or cpu. When I receive a message it sometimes flashes white and then bombs out and restarts itself. I want a refund as it is not my job to wait for a phone that should have been checked before being sold for any defects. Solomon refuses to do this and says it must be sent in for repairs and I have to wait 7 days for them to deter main what the problem is and if I would qualify for a refund. I am entitled to a 21 day cooling period on good bought to be refunded! I will be emploring every person I meet to not do business with this establishment as they clearly are not interested in serving their customer needs only their own pockets. Social media campaign will be my platform.