Biman grounded

Ashu, Toronto, Canada
I am a Bangladeshi Canadian and has been living in Toronto since 2002 with my family. I sponsored my father and brother and eventually they got immigration after three years. On 13 August, they were scheduled to come to Toronto by Biman but it is very regrettable that Biman changed their schedule 3/4 times and my 73 years old father has been suffering physically & mentally. They have been waiting in a hotel in Uttara to get a chance to come to Toronto via London. Could you tell me what I should do?