I have applied for 3 part-time roles. All of them are are part time in-store sales in fashion industry. All of them extended an offer. I verbally accepted all on the phone since things were not certain at that point. And now I need to turn down one of them. Reasons are the location and lower wage rate, and scheduling. But here is the tricky part: I don't know why but neither of the other two have a written job offer letter for me to sign (I started my training at one of them today already). They made it clear that I didn't have to sign anything as an acceptance. Just some paper work to officially be in their system. I don't know if that's normal for part-time jobs in retail industry. The problem with the one I want to turn down is that I made a schedule with them to do the training in 2 days. I didn't do any paper work yet because the manager said there was going to be an email for the paperwork but it never came. My concerns are:
will there be any legal issues if I turn down one of them which I verbally accepted?
What is a polite and apologetic way to turn down the offer? And should it be a walk-in or a phone call?