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...entire stock to another freezer so that nothing would be lost in the wait. I then informed my manager about teh issue and how I solved it."

The practice of interviewing candidates and then taking a while to make a decision is pretty standard. I don't know why companies do this, as it keeps people from moving on when they need to. As for the company 'using you'...

Take your dream job. Inform company B ASAP that you just got hired for your...

...interviewer asks about gaps when looking at your resume, simply inform him/her that you were working in an unrelated job at that...

The only time it may be appropriate is as squidmaster says when the customer is being abusive (swearing at you, etc.). Going around in circles is frustrating but does not rise to this level. Your response should have been...

Fair to complain if you didn't get what was promised

... say "Hi, I came in for an interview and was informed I would receive a call on the day giving me some working...

You should wait until at least this Friday to contact the company again. In the meantime, continue to apply for other jobs. Intending to make an offer is NOT the same thing as a signed employment contract. There could be many reasons for the delay...