Bad service delivery

Bought two Astrum PB070 Mini Ups items from them. Both worked for 2 months then both just died i did send it back and i was told on both the batteries was replaced now they come on but do not charge at all this company is taking me for a ride these people are not trustworthy once they got your money the after sale service is up to no good. This is South Africa there is a law protecting us as consumers i will not leave it here if i'm not refunded i will take this matter further .... i do not have time for companys selling no good lifetime items knowingly that it will give problems lying about replacing the batteries send it back to me and still not working. Why do business in this way your company name is at risk.