Trip.com complaint: Delayed flight causing missed connecting dlifht

I booked a connecting flight with them for June 23rd from Paris to Dublin, then Dublin to Isle of Man – one time payment, both included and scheduled by their website. Unfortunately, the flight from Paris to Dublin was delayed in the airport by 30-45 mins and then we sat on the runway for another 30 or more mins. Due to this delay, I was left with not enough time to catch my connecting flight. I called their service number and was instructed to buy a new ticket for the following day, and then to book a hotel, for which they would reimburse me for both, totalling £250 odd pounds.

I have now called, emailed and complained for 2 months straight for the reimbursement. They required proof of flights, proof of hotel. Then after following up numerous times being told that they are busy, I get an email stating that ‘this flight was in time’ in regards to the Dublin to IOM flight, and am told that they require proof that the Dublin to Isle of Man flight was delayed. In what world am I supposed to provide documents to prove that whilst I was in the midst of this, sat on a plane.
They numerous times were investigating the wrong flight, which delayed further.

The fact they know I called, directly after landing in Dublin to let them know the situation, and their guarantee means nothing. I would never fly with them again, and I implore you never to also.