I need a tax service that stands by the work in Hollywood, FL

My last preparer filed a return that triggered a math error letter, and when I asked for help fixing it, they said it would be a new fee. I’m looking for a tax service that puts their guarantee in writing and actually backs it up if something goes sideways. I live in Hollywood, FL and I want to hear what a fair policy looks like in plain English. Does your provider include a clear scope for responding to notices tied to their own prep, and do they define what counts as client error versus preparer error? If you have seen a firm that spells out response times, what is reasonable for acknowledging an IRS letter and drafting a reply? Examples of what they covered without extra charge would be super helpful.