SunSynk worst/non existent after sales support, product working only 3 weeks

We first installed a solar system system 7-8 years ago. We upgraded to a SunSynk inverter and 3x Greenrich lithium ion batteries which were installed on the 16th of November 2022. The inverter stopped working on the 6th of December 2022, showing error codes 18 and 34. (These error codes are related to overloading but we have no aircons, no stove/oven/appliances using elements or geyser connected to the system) The installer came out and confirmed the unit needs to be taken in for repairs. We did not take the unit back to the shop we purchased it at, we took it directly to SunSynk JHB thinking it will save time. It was booked in on the 7th of December 2022 and the job card (nr 2795, record nr 102704) was sent to us on the 8th of December 2022. The lead time for repairs were indicated as approximately 3 weeks. We expected to receive the unit back very early in January 2023. After numerous phone calls, emails and text messages, we finally got an update on the 10th of January 2023 informing us that the unit will take another 2-3 weeks to be repaired. From forums on the internet I've now learnt that a number of other customers faced the exact same problem with SunSynk. One person also mentioned that he saw "tons of Sunsynk inverters" at their JHB repair centre when he took his unit in for repairs. Another person stated that he had the same error codes that we had within the first week after installation. SunSynk also refused to replace his unit. We were surprized that they would not just replace our unit since it stopped working in less than a month after installation, what is the use of a warranty? With our first solar installation 7-8 years ago, we experienced a problem with the Mecer inverters shortly after installation. They replaced both inverters within 2 days of reporting the problem. I am extremely angry for not going with the known and trusted Mecer brand, I only received exceptional service from them. Unfortunately I can't say the same about SunSynk. They have zero after sales support for their overpriced product. I've been dealing with *** and also have communications with *** I will never recommend SunSynk to anybody, worst service ever (posting this on behalf of my parents)