The only way that I can make a reasonable sentence out of these words is as follows:
They are interested in how well we support our customers' after-sales policies.
That is, our customers have policies that control how they act in certain circumstances. One of those circumstances is the time after a sale has been completed. Hence, an after-sale policy or policies. They (whoever they are) want to know how well we support those policies.
I could, of course, be completely wrong.