replacement ups battery selling used/bad batteries Internet

I purchased a 12V sealed lead acid battery on March 3rd and received it a few weeks later.  I found out within the first month that this battery acted old and tired.  I contacted the company via email and they acted as though they would assist and asked if I had tested it.  I had it tested and found that it only had 30% capacity so it was clearly a bad battery.  I contacted them again with the test results and they have not replied to any of the 5 emails I sent asking for a replacement.  I would not do business with this company again as they appear to be selling bad and/or used batteries.