Discounts

Why does Xfinity require us to go auto pay in order to get any type of discounts.  I have had issues previously that was impossible to stop the auto pay process without cancelling my credit card.   I want the discount but don't want to be blackmailed into going to auto pay and then not aware of payment issues or other issues that may arise with auto pay.  I might have to see about a different provider for less amount that does not require auto pay in order to take advantage of savings plans.  Not to mention they keep wanting to throw in their mobile service as well as a bundle option.