Cant get a refund for excursion tickets

garda20

I booked a holiday to lake garda in August 2020 which has been cancelled by jet 2 ok that is sorted with them.i tried to get refund for excursion tickets from attractiontix which I paid for in full in January.they dont do refunds small print.tried to go through insurance (boots platinum insurance) not covered for pandemic.tried credit card company under section 75 they said wouldn't win as the tour company has stated no refunds even though the tours will not go ahead and I cant get there anyway even if I wanted to any suggestions