hired for coding/billing/transcription, but told no coding - confused

Accepted a job, gave 2 weeks notice, and yesterday was my first day.  I was to be helping out transcription (1000 jobs behind), and then sitting with billing and training with coding as their coder will be out on maternity leave in December.  The office is adding another surgeon, and they are rapidly expanding.  So I gave a proper 2 weeks' notice to my former employer (2 hours on the road there and back, low salary - now less than half distance and $3 more an hour) and started my new job yesterday.  This is my second coding job BTW.

My supervisor sat me down and told me what I would be doing to help billing.  I told her that I was excited about cross-training in coding and helping out there and she dropped the bomb that she should have dropped in our interview.  I interviewed with her and the office manager (3 of us in the same room all at the same time).  She said well, Michelle has a baby, comes back to work right away, picks up her work, and just never misses work.  Ever.  She will not need any help.  You will not be doing any coding.

I was emphatic in both our correspondence and in the interview that coding had to be somewhere on my job title and that I had to be doing it in some capacity for when I pass the CPC and that A is taken off my credentials after the proper amount of time.

I now do not trust these people at all, have regretted my decision, and was very upset since yesterday morning.  So, I emailed the office manager and told him of my concerns and relayed what my supervisor told me, and hopefully, this will be discussed today at work.  I came in Saturday and worked for them 6.5 hours to train while the office was closed.  I still have not received any formal paperwork at all from anyone there.  They really were not even prepared for me.

Confused.  Just venting.