OC Quantity Break Order Limits

Installed the app and had problems with cart; any time a customer tried to change an amount, it automatically would go to checkout; also, a customer could not delete any product from cart.
Reached out to support and waited 24 hours. No response, even though it shows they had been online an hour earlier.
I uninstalled the app and went to a competitor which is working fine and does exactly what I need it to do.