Help for headrest support on back bench

Hello Volvo municipality, I still can’t believe it! We have added a new child seat (Maxi Cosi – Rodi XP). During the installation of the child seat I wanted to remove the headrest on the rear bench, so that the child seat is right on the back bench. Now the headrest can only be folded forward (to put the back seat over). Finally I called the Volvo workshop and dared to ask the “banal” question, how to remove the headrest. Spotan could not help me anymore either and called me back after about 2 hours with the result that I can’t grasp: the car has to be removed to the workshop, because the headrest has to be removed – time expenditure 2 STUNDEN (of course not for nothing) – but I don’t see it as an option, because I don’t use the child seat only on one side. Can maybe someone help me here, how I can dismantle the headrests ? It is a V70 construction year 2003 with which I’m otherwise very satisfied. Grus Bernie68