Dealer said they heated to unfreeze the rear toe adjusting bolt, but it did not work.

What is the cheapest solution?

The car is 1992 300D, 124.128 chassis.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.

Hi
I would try to cut the bolt with a thin blade, without damaging the control arm. Then insert a new bolt. If that does not work you need to destroy the control arm and get a new one.
Regards, Bruno

Just realized: you write about the rear. I'd replace the link including the frozen bolts (on both sides) after having used the cutting wheel to get them off.

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1992 300TE 160 kmiles