Poor quality jeans

I bought a pair of Levi jeans a few weeks ago, those that are slim(ish) fit with type of stretchy material.

In store I specifically asked if the jeans could "over" stretch after washing, seeing that it is made of stretchy material. I was guaranteed that it would not stretch.

Well now after throwing away proof of purchase slip and washing the jean it stretched so much that almost two of me can fit into the jean and almost R800 bucks down the drain.

I feel it is rather poor quality products and I would definitively not buy Levi jeans again.