Agreed upon price changed, newly installed parts failed & i was told to not come back to the worksop

After we agreed up on a price the owner wanted to force me to pay more, this after I asked him 2 times are you sure that is the price for everything before the job started.

On my way home the part that they replaced came loose leaving me on the side of the road. When I called them they told me there is nothing they can do and I must not come back to their workshop ever again.

DO NOT TAKE YOUR VEHICLE HERE YOU WILL BE SORRY!!