How do you ensure your transactions are honored?

For example, imagine you want to buy a good or service from a merchant… so you send an agreed upon Bitcoin sum to the merchant’s Bitcoin address. And then the merchant dishonors your transaction and doesn’t actually deliver the good/service, what can you do?

EDIT: many here have mentioned escrow services and legal recourse, do these solutions not reintroduce 3rd party risks and reliance on fiat government support? IMO, if govts eventually try to shut down btc, restricting businesses’ ability to support it, bad BTC actors could ruin the ecosystem for everyone by not delivering as agreed. Or is my thought process wrong?