Reverse lights stay on

Sounds like the sensor/switch in your gear-leaver / drive mode selector for reverse is broken.

This site suggest you need to replace it and it can be done from below the car. But I´m not to sure about model years so may be implemented a bit different with yours.

You have a defective reverse light switch, which is screwed into the transmission. C172 in the image below.

Fairly easy fix to replace it with a new one. Disconnect harness from switch, unscrew switch from transmission, screw in new switch, reconnect wire harness.

NOTE: If this does not fix the issue then it is a wiring problem, the reverse lamp circuit is shorted to a hot at all times wire somewhere in the harness.

I would suggest that there is a connection between a permanent live and the reverse light wire, probably in the boot area.

This is because : One, reverse lights usually work only with the ignition on and these are on all the time.

Two, if the false connection was prior to the switch and the switch has not failed, then the lights would go out when not in reverse.

Three, you have existing issues with fuses blowing : which leads me to suspect some damage somewhere...

So, this connection / damage has to be found - check all the rear wiring - has it got a tow bar? Has a connection been made, in error, with a live wire? Some people, when fitting tow bar wiring use whatever colours come to hand and the functions don’t match the colours...