Repair on Troley Speaker

I bought a trolley speaker at the store on the 24/12/2016. As per instructions I have maintained the speaker and used it at least 4-6 times. The battery was charged every 2 months; however I have not once used the speaker without it being plugged in. The first time I wanted to use the speaker on the back up battery, it did not work. I went home and charged it again and still it refused to work without being plugged in. I returned the speaker to the store on the 22/10/2017 where Beauty told me that they would return it for repairs in JHB. I've asked her how long it would take and she said repairs usually take up to 21 days. I have had no feedback from anyone at the store and went back to the store round about the 18th November and they have had no feedback. On the 24/11/2017 I spoke to Gloria and she said that she will follow up and get back to me... no feedback, went to store on the 25/11/2017 and said I would like my money back if they can't tell me what is wrong with my speaker and why is it taking so long ... it's been longer than a month! They keep on promising to return my speaker by the following week but it never happens! On the 02/12/2017 I spoke to Gloria and she said that she' been trying to get hold of me but she thinks that they don't have the correct contact number, however she never checked the number with me again ... She then said that it was the battery and that I should pay R220.00 for them to install a new battery.... I was upset because the speaker was still under warranty and that's when Kenneth the owner/manager told me that was the message they got from their HO and I can phone them, but I will have to pay for the battery to be replaced. I told him that it has been longer than a month for them to inform me it was the battery, where he apologised by saying that it was their fault the speaker stood in their branch for almost 2 weeks before they send it back to their HO. I was upset and refused to pay for it because the speaker was under warranty. I said I would call the HO. On the 03/12/2017 I went (after I have calmed down) back to the store and said that they should replace the battery, Stefan also a manager/owner said that they would inform their HO and that I can pay for the battery once the speaker was returned, he just needed me to confirm that I would pay the R220.00, which I did in front of his staff. I've asked when my speaker will be back and he said that they normally get their deliveries on Tuesdays, where I told him I would be there to collect my speaker today 09/12/2017, because I work during the week. When I got there again today Gloria informed me that the speaker yet again was not there. This is really bad service! Yet again another week will go by and another promise that I will get my speaker next Saturday. This is really BAD SERVICE and I WILL never deal with them again or suggest anyone to deal with them!