Just being honest...You shouldn't be stirring the pot when you're in your 30 days. Especially asking for a transfer and talking with HR, who doesn't really do anything else other than hire people. If HR talked with the center management, they probably see you as a problem child now and you burned yourself if that's the truth. Also, I believe your seniority date is when you achieve your 30 days. Volume is low and they might just be trying to get other trainee's up to the speed that you're supposedly at so they gave you a few days off to focus on that.
Also, asking for a transfer within your first 30 days is being really soft.