Suntank solar pathetic service

Most pathetic service i have ever dealt with. Bought a geyser via one of there suppliers. Paid a hamdsome amount and after 3yrs the geyser is leaking. The issue is my installer which is there supplier as well as myslef have tried over the past 6 to 7 months to get hold of them to sort the claim out. Absolutely no feedback whatsoever. Even called and spoke to 3 of there employers as well as whats app etc etc. Nothing. They keep promising t9 get back to you with absolutely nothing. I have records of calls as well as names as well as whats apps etc etc. Be very very weary of this company especially when it comes to there claims