Canceled flights

I have booked flights almost 2 months ago to George for my wife's birthday with the airline and only received a message on Monday stating that our flights is canceled with mo explanation or reason why. I tried several times to phone the call centre but no answer.....see below

Dear Mango Guest,

Please note that flight schedules has changed due to limited flights operating. Your flight on the 10NOV20 JE817 has been CANCELLED. Please call this number *** for further assistance.

Mango apologizes for the inconvenience. Mango Team