ISO 17021 that Sindey mentioned is very specific and clear as to what the relationship between the registrar/CB is supposed to be; how appeals are to be handled, documented and process communicated; how audits themselves are to be scheduled, planned, performed and recorded (by using reference to IAF documents like MD5) and other cool stuff. If your CB is accredited, lets say by ANAB, UKAS or similar bodies then 17021 is an absolute they have to follow as is IAF MD5, so the information you are seeking should have already been communicated to you and definitely questions must be answered.
If you are dissatisified you have the right to file a written complaint with your CB's accreditation body (oh yeah they have to give you the contact information), and guess what...Your CB can get a big fat NC themselves and YES, as has happened to others paraphrasing the language of your auditor..."Get their certificate pulled" if they don't want to play right
If you are dissatisified you have the right to file a written complaint with your CB's accreditation body (oh yeah they have to give you the contact information), and guess what...Your CB can get a big fat NC themselves and YES, as has happened to others paraphrasing the language of your auditor..."Get their certificate pulled" if they don't want to play right