Faded ink on restaurant bill

Just came back from a restaurant where the final bill was illegible due to fading ink. Same thing happened a few days ago at the same place and I expressed my annoyance....this time I gave no tip because I think this is bordering on a "scam" to the extent it lets waiters play with the numbers.
I used to think this was an "accident" but after 10 or 15 such incidents around Mexico I now think this is an attempt to avoid accountability. After all, how much does it cost to run down to Office Depot or the local print shop and score some ink?

Since I’m pretty sure you won’t do the right thing, at least tell me the name of the restaurant and I’ll go pay the damn tip you should’ve left!