It is clear to us that there are no ground for reimbursement.
Where did they say you used perfect strategy and didn't cause the house edge variation?
With not saying that my playing style caused the 4,6% experienced house edge, they confirmed that I used the perfect playing strategy.
Their explanation why I experienced a 4,6% house edge instead of the advertised 0,5% is variance:
Regarding RTP, it's important to note that this figure is based on a calculation involving at least 1 million bets.
In short sessions with a few hundred or thousand bets, variability is expected, it is impossible to make accurate calculations based on these sessions.