All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad
is His slave and Messenger.
You are not to be held accountable for customer inquiries and for addressing
their problems related to your products, and this does not affect the permissibility of your work as long as you do not engage in or intentionally assist in anything forbidden. Allah Almighty says (what means): {No one will reap except what they sow, and no soul burdened with sin will bear the burden of another.} [Quran 6:164]
Also, Allah Almighty says (what means): {Every soul will be detained for what it has done} [Quran 74:38]
Lastly, it is sufficient for you to advise and forbid what is wrong as much as you can.
Allah knows best.