There is a non-zero net force in this instance because the direction of the parcel's path is changing (a form of acceleration). In this case, the pressure gradient force is greater than the coriolis deflection because the parcel's path bends to the left (not straight, as it would be if the two forces were in balance). The net force is inward, and is called the centripetal force. The magnitude is $\displaystyle{\frac{v^2}{r_0}}$ where $v$ is the parcel's speed and $r_0$ is the radius of curvature of the parcel's path.