Please help me stop them!!!
Detaching the servos is not the way to stop them. If they are continuous rotation servos, there is an angle value where the servo stops. You need to determine that experimentally, then write that value to the servo to make it stop.
When using continuous rotation servos, the writeMicroseconds() method is preferred to the write() method, as it gives better control over the speed of the servo. The value ranges generally from somewhere between 500 and 2500. You need to determine the minimum value that makes the servo go fastest in one direction, the maximum value that makes it go fastest in the other direction, and the value (range) that makes it stop.