Swift LED light problem

[moncman]

This might have been covered in an earlier post but we have a problem with our 2019 Swift Challenger 590 with Sargent electrics and LED lights. When connected to the car the indicators are on (not flashing but dimly lit) all the time. I'm told this is not uncommon and affects some BMW, Land Rover/Range Rover, Mercedes and Volvo models. Sargent do a vehicle lighting modification module (VLM) of which they are now up to VLM6. Thing is, surely if they have a fix then the van was not fit for purpose in the first place. My dealer wants 150 quid to fix my 23 grand caravan. Another option is to update the car but the guys at Portland Towing in Lincoln tell me there's not a trailer module for my car - a late 2010 XC90. It is fitted with westafalia detachable bar and vehicle specific wiring, but not Volvo parts. Any advice gratefully received. My inclination is to dig my heels in and claim the van was not fit for purpose under the Consumer Rights Act of 2015 and try to get the VLM6 fitted foc.