Very bad service from Lufthansa & Swiss Airline

I was traveling from Johannesburg to London on business class via a Frankfurt short layover. My mobile phone fell under the seat, I immediately informed a flight attendant & they assisted me to retrieve this. When the seat was moved slightly, I could see my phone still in good condition but the flight attendant moved the seat abruptly to create more space to retrieve the phone and smashed it with the seat brackets destroying the phone fully. They then declared the phone unsafe & confiscated the phone to secure in a special bag to dispose off when they land. This was an expensive phone - I Phone 14 Pro Max. The pilot could not give me a solution on the way forward. I arrived in London without a phone, could not call anyone or use my Uber app. Great inconvenience. Then only to realise that my bag didn’t arrive & was only arriving in the evening so I had to return to the airport 5 hours later at my cost to pick this up. It gets worst, on my return trip via Swiss Airlines, my flight was initially delayed then cancelled all together, I had the inconvenience of having to retrieve my luggage & rechecking in through all the airport procedures to another flight via Mauritius which left very late, I was already in the airport for six hours. I had a flight booked from Johannesburg to Durban based on the initial cancelled flight, so when I eventually arrived in Johannesburg, there were no flights to Durban to get home so I had to stay over that night in a hotel and leave the following day all at great expenses and inconvenience. I have since reached out to the airline but to date there is no reply and solutions, so will have to go legal and consider a law suite against them - Lufthansa & Swiss Airlines. Worst airlines to fly ever, very disappointing customer service!