Faulty Phone

I bought a phone on sunday, my child left with the phone on monday, on tuesday, he informed me the phone is laging, and goes off by itself, on wednesday he sent me a picture of the phone that froze, i went to pep, informed them of the situation, they said, they need to send it in for repairs, which will take 2 weeks, of which i refused, then they said if my child is not back within the 7 days, they will not refund, of which i also refused, as i reported the issue. They gave me a faulty phone, now refuse to refund or replace the phone, of which i find unreasonable. This is pathetic service, and i want a refund, or i will report it to the ombudsman, as the management at pep polokwane is useless!