URGENT Please Help - CA's

 Suppose let us assume that there is a company called ABC & Co. And the company accounts are audited by XYZ Chartered Accounting Firm. ABC & Co is a Private Limited Company and is client of XYZ Firm for past 10yrs. ABC & Co now want to change the auditor because XYZ Firm is not giving valuable suggestions for developing the Company. Is it possible for ABC & Co to change the Auditor? If yes, then what is the procedure ? Will there be any problem in the future from the old Auditor ? Will the old Auditor leak company information to ABC & Co.'s competitors ??

Please explain me in detail.

Thank You