Poor follow up service

Bought a inverter from them 6 months ago and it worked like a dream (gave them 5 stars) ..l could connect my monitor and PS5 and play through loadshedding with no issues..fast forward 4 months the inverter barely lasts a hour on the same load..(25%) tried to reach out last month since it’s under warranty and l was told there are no replacement batteries in the country ..tried again today and got no response 😑😑….if you buying just know it’s meant for short term use by the looks of it after month 4/5 you will only use it to power the router