Prevent Rigidbodies from going through Interactive Cloth

I have an Interactive Cloth (that is connected to static Cubes at the sides but free to stretch in the middle) upon which Rigidbodies (Spheres with high Drag and low Mass) are pressed. Up to a certain degree the Interactive Cloth forms and stretches around them as is expected. But as soon as the pressure is to high they pop through the Interactive Cloth.

Is there a way to prevent this from happening? I.e. make the Interactive Cloth stretch endlessly?

I experimented a lot with the Interactive Cloth's parameters but so far have not found a solution. Also it is not tearable from the Attached Colliders. isTeared also never switches to true. The spheres somehow seem to pop through without the physics noticing.

Any input would be appreciated.