The emphasis is on selling and delivering new vehicles by the end of the month. Since used vehicles don't count, it's not surprising Tesla has placed that at a lower priority, at least for the rest of June.
This quarterly push to meet sales/revenue/profitability goals is artificial and has always put a lot of stress on Tesla resources at the end of each quarter. If you're trying to purchase a new vehicle - you can often get extremely rapid response and delivery.
When Musk tried to take the company private, a major reason was to eliminate this artificial push at the end of each quarter to meet Tesla's aggressive growth goals and achieve quarterly profitability.
If you have a nearby store or gallery, that is probably your best strategy for the next week - go to them, ask for their help, and if they can't provide it, see if they can get you in contact with someone who can.
Tesla is going through a difficult transition right now, figuring out how they can more efficiently support an increasing number of vehicle sales each quarter - and that's putting stress on the entire company - especially at the end of each quarter.
Based on how Tesla has operated since the Model S was introduced 7 years ago, I expect them to work this out over time, and get back to providing reasonable support for used vehicle sales, customer support and service.