OP said earlier he got 21v at input and output of controller when batts not connected, so Voc on panel wires into the controller was 21v. This means they are in parallel. In series it would be more like 42v.
If it is too difficult to get a replacement controller from the seller, it is simple to get another from ebay. While waiting for that to arrive you can still use the solar on panel-direct. Just unhook it during the day if batts get past 14.8v and also before dark (in case the diode is in the controller) then hook up again in the morning.
You only really need a controller for when you will be away from the rig when it is likely to go up past 14.8. If that happened when using panel direct after I fried a controller one time, I would shut it off and then reconnect after getting back such as when going swimming in the afternoon and voltage was getting up there. Ease of mind to unhook it before going away.