Strange situation. Sorry you had a bad experience. I always double-check the charging wand.
Here is the roadside assistance policy:
https://www.tesla.com/sites/default/files/downloads/roadside-assistance-policy-en.pdf
These are the words I think that are pertaining to your out of pocket costs.
Tesla hereby disclaims any and all indirect, incidental, special and consequential damages arising out of, or relating to, roadside assistance, including, but not limited to, loss of vehicle value, time, income, personal or commercial property, or use, inconvenience or aggravation, emotional distress, commercial loss (including lost profits or earnings), bus fares or other transportation costs, vehicle rental, gasoline or lodging expenses, damage to tow vehicle, and incidental charges such as telephone calls, facsimile transmissions, and mailing expenses. The exclusions and limitations in the preceding sentence shall apply whether your claim is in contract, tort (including negligence and gross negligence), breach of warranty or condition, misrepresentation (whether negligent or otherwise) or otherwise at law or in equity, even if Tesla is advised of the possibility of such damages or such damages are reasonably foreseeable.