Don't book tickets from Budget Air

I booked returned tickets from CPT to BOM for ZAR 10892.00 , i paid high amount because i don't want too much travel time but now i received a email from budget iar by saying you date and travel time is increased to 41 hours previously it was only 16 hours time.

i realize that if you take all premium service of Budget Air in that case they wont cancel or reschedule the travel but if you wont then they defiantly ask for long hour journey

in my opinion its a cheating