sum problem

After replacing the eilbach with the original springs I wanted to have my sum updated and the headlights recalibrated. The dealer told me he could not get contact with the sum unit. This was allready the case in the previous situation with the eilbach springs, but nothing has changed. The dealer suggested to replace the whel sum unit, They could not give me a price for the replacement nor the guarantee that this would solve the problem.
Anyhow I am not so happy with this. Any ideas or suggestions?