Error in the supplier’s calculation

Q: I do accounts for a certain person. Recently, a situation arose where according to my books, we owed a supplier R100 (for example), but according to the supplier, we only owed him R50. The reason for the difference is that the supplier made a mistake in his calculation. I pointed this out to my employer but he still chose to remain quiet. What should I do?

Accepting card payments

Q: I wish to inquire further regarding Mufti saabs ruling of installing atm machines on one's premises. Will the same ruling follow a card machine facility, with which many benefits exists but a customer may also pay with a credit card from haraam funds(interest bearing loan / overdraft, etc.)?