Disputing a Charge on Debit Card - Pros v. Cons

Long story short, a company has charged me a relatively small amount [$75] that I feel is in error. Basically I think the the company is trying to take advantage of me and is over-charging me despite a very clear agreement on what the charge was meant to be [we were so clear in fact that I believe the manager at this point is just lying to me]. I have attempted to contact the company owner and they stand firm in their stance and I stand firm in mine. Is it worth going through the hassle of disputing the charge with my bank [and the possible collection dispute afterward] or should I just swallow the pride and pay the amount?

For those that don't wish to read the whole thing - is $75 worth it?