Booking.com / gotogate.com = *********** par excellence !!!!!!!!!!!!

Made a booking through Booking.com / gotogate.com & received confirmation on 02.02.2024. It's now 3 weeks!!!!!!!!!!!!!!!!!!!!!! that I'm trying just to have my return flight extent with 1(one) day !!!!!!!!!!!!!!!! This seems to complicated to them/Mohd F/Pratham.S/Ahmad K/Poornima M/Assem E./Donia M/Sneha P/Mamta M/... Have sent to them, Booking.com / gotogate.com, more that 90 emails!!!!!!!!!!!!!!! Still nothing, except 'system generated' emails!!! NO customer service/ NO resolvement/ No action/ No results