Faulty cellphone

I bought a cellphone and Ackerman's west Street Durban on the 3rd of May and only to discover that sometimes it stucks and I have to remove battery for it to function again.i went there today on the 7th of May for an exchange or refund but I wasn't assisted,I stood there for 2 hours waiting for the store manager.the manager ended up not coming to me but instead he sent a staff member to tell me there was nothing they can do to help me.here I am with that very phone without exchange or refund.they said they do see any problem with the phone,I was lying and they can not send it for repairs either because they can't identify the problem.i just need my money back