I have just received a mail saying that I have authorised a purchase for

I have just received a mail saying that I have authorised the purchase of Space Qube PMT for $120.15.

Kindly note that I have not authorised this purchase. Please cancel the order.

I am writing this to you as I have great difficulty in navigating through my account to cancel this order. I even tried to call your number in India. There was no one to pick up this number.

Please do the needful at the earliest.

Thanks and regards

Dixit