This has happened to me twice - in 2018 on a new Model 3 they charged a bit over $200 in extra sales tax. The error was caught at when registering at the local tax collector. After contacting Tesla they ran the numbers admitted fault, and issued a refund check after months of time spent having emails forwarded to every department at Tesla trying to figure out what the issue is.
Fast forward to this year purchasing our second Tesla, we look over the state/county/city sales tax numbers that are supposed to be charged and they do not match the number on Teslas paperwork, again by over $200. When this error was brought to the attention of the sales manager, they claimed that the paperwork process is “all automated” and they don’t have the authority to change the numbers and we were left with a take it or leave it scenario. We even asked for a detailed breakdown of the sales tax being paid and the manager was unable to do so, and by that point was apparent that no body working that day had a functioning knowledge of how the numbers on MVPAs work. Pretty unbelievable. Now we are going through the same process all over again.
So in summary there are errors in Teslas sales tax collection computer system that have existed for 4+ years uncorrected and nobody at Tesla seems to care about fixing them. So yes, I would encourage anyone buying a Tesla to go over their contract very carefully and demand a refund if the sales tax numbers are not correct.