Bad service

I bought a hoverboard online and paid it on the 21 December 2017. I called them on the 9 January 2018 because I still hadn't received my purchase. I understood that it was Holidays. I was told they were back on the 15. I called on the 15 and they took my number and promised to call me back, which never happened. I called again on the 18 January to no avail. I called again on the 22 January and told the sales rep of my frustration. He asked me to send proof of payment,which, I did. He told me they don't have stock in their Cape Town office and will check with their JHB office. I was sent pictures of the type the JHB branch has on stock,which I said is fine. On the 24 I sent a message asking when the delivery will take place as I was leaving for Mozambique in 2 days time. It was delivered on the 25 January 2018. It worked fine, however, on the 26 it stopped working. I was in Mozambique by the time my son alerted me that his hoverboard had stopped working. Upon my return on the 5 February, I went on their site and found out that for them to fetch it I needed to pay R299 seeing as it was after the 7 days of warranty. I paid the fee. I was sent an email the same day asking to explain in detail what the problem was before they collect it, which I rep**** to the same day. On the 8 February I sent an email asking if they had any idea when they would collect the hoverboard for repairs. That e-mail to date hasn't been answered. I called again on the 12 February and a lady took my number and promised that I'd be called back before close of business, again, that didn't happen. I called again on the 14, same story was given. Again I wasn't called back. I called again on the 15 February, same story but no call back. I called again today the 19 February 2018, by now, I'm ****ed off to say the least because I've been told the same story but no action. I didn't receive a call back like the other few times before. I'm sitting with a hoverboard that only worked for 1 day and it has taken 3 full weeks of back and forth but the hoverboard is still sitting in the back of my boot. How long must I wait until it is repaired?