Customer Service complain

I bought Ellies inverter at Makro store worth R10,399 in March 2021 to use it as a back up, after o bought I realized a warranty is 12 month. From April 2022 I started experiencing issue about a battery it was longer than 2 hour, then in July-Aug a battery would only last for an hour or less. I took it to Makro and I was told it is out of warranty and I have to buy a new battery worth R3200, I complained that I was never told before buying that a warranty is 12 months and how can I pay 10,399 for a product I can use for only a year, they referre to Ellies. I contacted Ellies on 02/09/2022 and requested that my query be escalated to a manager who promised to call back but never did. I sent the manager an email on 05/09/2022 and he called me and told me it's not their problem that Makro did not make me aware about the warranty period and I explained how I use a product n he said it should then last for 4-5 years and it's needs to be checked and I can bring it to their office but I still have to go back to Makro. I asked him to send an email explaining everything he said on the phone so that I can convey the correct message to Makro. I sent him another email on 06/09/2022 reminding him of my request till date I haven't heard anything from him. I will be taken from pillar to post yet someone could assist. I didn't know about a 12 months warranty for a price of R10,399 that I spend. I wouldn't have bought it. Ellies-Makro needs to sort this, I'm seating with a product that I cannot use with so much money I paid.