Slingshot has the worst customer service, stay away from them! I was with Spark and zero issues for years, then had the brilliant idea of switching to Slingshot and the experience has been really negative.
When you call them they promise to call you back with a solution and that doesn't happen, they keep charging you for their best service and the speed is no where near and when you call their customer service you often find rude staff, no helpful at all.
And then you have the no-dramas clause which is pure rubbish, they won't let you go without paying an Early termination fee, I see no point on the clause then.
Terrible experience, do something from your own sanity and stay away from them.