Take care to buy expensive electronic stuff

I bought a R3000 Digimark inverter in Jan 2023. Very pleased. Good & easy working untill Aug 2023, when it start continuous beeping. I could not find the address for Digimark . When I contact SIK, they were not even prepared to look at the inverter. They refer me to an electronic shop to visit - no address or telephone nr. I could not trace the shop. One should not buy electronic stuff from SIK. Otherwise it is a good place to look & shop.