No customer service

I bought a JVC soundbar on credit from house and home at East Rand Mall which stopped working and I reached out to them for assistance initially I thought it was just a connection cable that was faulty and I spoke to June who advised I could bring it back and she'll contact their head office this was 3 weeks ago she said the warranty no longer applies as I purchased the item more than a year ago however I can claim from the extended guarantee as it was charged on the account. Everytime I call June her answer is "the person that should assist me is on leave it's been 3 weeks and I phoned her again this morning and she said the same again the lady that I need to speak to is on leave, I then asked to speak to the store manager and she advised she's also on leave. I asked her to give their head office email address so that I can contact them directly and she said she doesn't know the email address. I am really frustrated annoyed by this situation that I'm in.