Gotogate Request For A Of Compensation For Unused Flight

I purchased a return flight ticket from Vilnius to Dubai through Gotogate, under Finnair, with Gotogate reference 88E572 and Finnair confirmation number 88FCZ9. The return flight was scheduled to take place on 6 March 2026. On 4 March 2026, I received an email from Gotogate informing me of a change and offering an alternative route via London Heathrow Airport. The only alternative offered required me to travel through the UK and therefore apply for an ETA. This ETA application cost me 100 GBP. As the routing and schedule also forced me to stay overnight, I additionally had to book accommodation, which cost me around 206.13 AED. I accepted this alternative in order to be able to travel, but I find it unacceptable that the solution provided by Gotogate resulted in significant extra costs for me. I contacted both Gotogate and Finnair customer service regarding these additional expenses and asked for a refund, but I was told that they cannot refund anything because they claim it was my own mistake not to know about the ETA requirement for entering the UK. In my view, this situation arose due to insufficient information and the way the alternative route was offered, and it directly caused me to miss my original flight and bear extra costs. I request that Gotogate provide at least partial compensation for the ETA fee and the accommodation expense, or another fair amount that reflects the financial loss and inconvenience I experienced because of this forced rerouting and lack of clear information.