No delivery of goods

Insurance claim - new Sony M4 phone was issued on 8 December. Back home it was found to be defective. Returned the phone to Vodashop Savanah Mall within the time limit. They sent the phone back to Sony for repairs. I refused to accept this as the phone was defective when issued, and I should be issued with a new phone. Vodashop agreed this is the correct procedure. After 10 days I still have not received a new phone. Gentleman at Vodashop not competent to handle specific incident - Bright Majola ***