Service guarantees

I know of accountants who offer one or more of the following service guarantees to their clients:

• If client supplies all their records within agreed timescale we will complete their accounts by the agreed date;

• Ability to contact me and to get a reply within 24 hours;

• Thirty day turnaround of information supplied or client gets their money back [this accountant seeks upfront payment];

• Accounts prepared by a specified date or fee is refunded [this accountant also seeks upfront payment];

• "Your tax return with you within 14 days of us receiving all relevant information";

• If your primary contact partner is unavailable an alternative partner will be available.
  

Have you asked which elements of their service your accountants is willing to guarantee?