Deltec BR12V100 DC (Deep cycle AGM batteries)

I bought two Deltec BR12V100 DC batteries from Pro touch batteries Claremont (Pretoria) in July 2022. I took the batteries back in February 2023 because these batteries do not even last 45 minutes when used to only power the wifi. I got the batteries back in April 2023 and they did exactly the same thing. I took it back to Deltec again in May 2023, I am still to hear from them. Please don't purchase these Deltec batteries, make a better choice.