German phrase
Bei Problemen wenden Sie sich an ~.
Meaning
If you have problems, contact ___
When to use it
It tells you whom to contact. This polite, official wording suits company or service information.
Example dialogue
Was soll ich tun, wenn das Produkt Probleme macht?
What should I do if the product causes problems?
Bei Problemen wenden Sie sich an unseren Kundendienst.
If you have problems, contact our customer service.