Are you sure they said "hasta siempre"?
- Hasta luego = see you soon (or write each other soon)
- Hasta nunca - when you're angry, like saying: "I'll never see you again"
- Hasta siempre - long goodbye, for an indefinite time. It's quite used in funerals, but also as a very polite goodbye (in a letter to somebody you don't know very well and who you're not pretending to write soon)
Maybe they wanted to be polite.
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