Hmmm...
I can see Ken Smith's point...however, that cold sorta response doesn't make a customer feel very good.
It should be more personal...for example...
Dear "Name Here",
We apologise for your issue with your bass. Unfortunately, as the cost of two pots is below our minimum order, may we suggest that you increase your purchase value?
For example, you could purchase a set of our TCRM strings.
Again, we apologize for the inconvenience.
Now this says the same thing, but it's not nearly as offensive.