Where is my soeaker

On the 13th of October I received a JVC XN915PB trolley speaker as a gift. It was purchased at HiFi Corporation in Rustenburg. On the 17th of October I used this speaker for the 1st time in my Zumba class. After 1 week we started noticing that the sound was coming and going on this speaker. I returned it to the store on 25 October, and was told it had passed the exchange warranty time frame and would have to be sent in for repairs( it was bought on October). After 21 days I returned to the store and was told that it was still in repairs but that they sent feedback claiming Customer Abuse. But that they had not sent my speaker back or given any further explanation. I refused to accept this as an answer and the Customer Care lady sent an email that they did not reply to. On the 3rd of December my husband and I returned to the store and was told another email had been sent. I called for the manager and he promised to get answers for me by Monday, the 5th of December. I have still received no feedback. It seems my birthday gift that cost R3300 was wasted money and they are not even returning my speaker. I want my speaker either repaired or replaced. Can anyone assist in this matter?