My site was being hosted by another hosting service and without my knowledge was sold to Deluxe Hosting. It took quite a long time to find out where I had to go to renew my Domain Name. Finally found out it was Deluxe hosting. They were helpful and courteous.
The reason I didn't give 5 stars is because I believe the company that your site is sold to should send you an email notification and tell you how and where to login.