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+20% clamp means the new clutch is 20% more clamping force than the stock clutch.
On the other hand, you can't be serious.
Previous owner receipts can be a bit tricky to decipher. Take the example of my folder pile... 90% of receipts are hand written from years ago and lacking the same information as yours. Some are quite broad descriptors such as "high lift sport cam" with no additional details (I disassembled to find they were Crane cams and had part numbers stamped out of view on the end). This is not atypical. I wouldn't expect to phone up the shop that did the work with only a receipt number and expect them to have any detailed record of parts used on a job unless I had picked the car up with that recent work completed the day before.
You weren't even the customer of record for the work... these guys don't owe you anything and if you flipped an attitude or temper tantrum on the phone then I'm not surprised they told you to take a hike.
My $.02.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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