AUSMA solar lights explosion

I bought 3 AUSMA 100W solar lights at a cost of R1300 each.One of them went faulty and exploded with such ferocity that the front glass shattered and the battery was found in my garden, burning and smoking. They are still under warranty so I took it to the agents and they bluntly refuse to replace/fix the unit.They found that their panel overcharged the internal battery, hence the explosion.They play the blame game and blames the shop that sold it to me, as selling me the wrong equipment.The shop blames AUSMA as they supp**** it to them as a paired unit. So stay away from bad quality, no warranty, no service and dangerous equipment. I will now get rid of the other 2 lights as they pose a fire and damage risk. With the power shedding issue in this country, everyone is out to **** the customer with bad products and make a quick buck, i think this brand is one of them.