Worse experience ever

We had the worst experience at six's with my friends, my friend went in just after 7 and ordered the buy one get one free drinks, Gontse agreed that they will do it for us, Keith was also there. Next thing the bill comes and they charged us for 6 ****tails, which we never ordered, we only ordered 3. They told us the way we gonna pay the bill, whether we like it or not, and left, Nico sent the waitress and refused to come back and speak to us, we ended up paying for what we never ordered, went outside and Nico followed us to insult us and tell the security to not speak to us, after he told him how we can't afford to pay, he stood outside and continued to I sult us because he assumed we had no money