Car battery nightmare

My vehicle had a battery problem, I called cartrack to alert them of the power failure alert that the car experience and explained that I will buy a battery soon. They recommended that they have a service provider that can assist with the battery replacement. I requested a quote for it and I accepted the quote and bought the battery. Deltec battery came and fitted the battery, little did I know that the battery was incorrect type for the push start vehicle. 2days later I tried to start the car and the battery was completely flat, I contacted cartrack for assistance and I was told to get the car jumpstarted to determine if it was the battery. I called AA and they jumped it and the car was idling and after driving a while the battery was full and I left the matter. Battery installed on 4th March and jumpstarted on the 7th. I continued with the battery that I need to start the car daily for the battery not to die. In May I had the same problem as I was away for a week the battery died. I called cartrack that referred the matter to deltec. Their technician came and couldn't jump start the car as it was completely dead. They took the battery on the 16th of May till to date. I have been perstering Deltec for my battery as it is under warranty, today I called and the manager told me that they will be returning the old faulty battery as they want to see if it will fail again. The inconvenience is on another level. That I am told that the battery is not adequate for the vehicle but a service provider wants me to continue struggling with their product that is not meeting the desired performance for the vehicle for them to prove a point. I am enough with this poor service. Can I please get my money back and they can keep their lousy service Soo that I can buy a battery from a reputable provider