I had a lufthansa flight cancelled due to company policy of how long you could sit on the tarmac. They had an instrument go bad, had a spare on hand but could

I had a lufthansa flight cancelled due to company policy of how long you could sit on the tarmac. They had an instrument go bad, had a spare on hand but couldn't find it in time. Flight got cancelled and I got rebooked for 4 days later. Which was after my business trip so I cancelled. I'm still waiting on my refund 3 months later. Everyone I speak to is nice, polite, agrees to refund me while saying but we'll have to call you back "because policy", pretty annoying. Whatever, i'll get it eventually I'm sure I don't particularly care for Lufthansa.