Similar experiences with Lufthansa. Using legal mechanism yourself it's an uphill battle, you could use something like airhelp if your flight got cancelled/delayed for long.

Regarding reimbursements they can't help, I'm waiting myself one from April and one from June. One flight hotels (police told passengers to leave airport and pay for hotels), other lost luggage. Impossible to get any information from Lufthansa after I sent my bills and demands.