THIRD AMENDMENT TO EMPLOYMENT AGREEMENT

Exhibit 10.47C

THIRD AMENDMENT TO EMPLOYMENT AGREEMENT

This Third Amendment to Employment Agreement is made and entered into on the 22nd day of February, 2008, among CSG SYSTEMS INTERNATIONAL, INC. (“CSGS”), a Delaware corporation, CSG SYSTEMS, INC. (“Systems”), a Delaware corporation, and RANDY R. WIESE (the “Executive”). CSGS and Systems collectively are referred to in this Third Amendment and the Employment Agreement as the “Companies.”

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WHEREAS, the Companies and the Executive entered into an Employment Agreement dated April 25, 2006 (the “Employment Agreement”), a First Amendment thereto dated March 6, 2007 (the “First Amendment”), and a Second Amendment thereto dated August 14, 2007 (the “Second Amendment”); and

WHEREAS, the Companies and the Executive desire to further amend the Employment Agreement as herein set forth;

NOW, THEREFORE, in consideration of the foregoing recitals and the agreements of the parties contained in this document, the Companies and the Executive agree as follows:

1. Effective as of January 1, 2008, Paragraph 4 of the Employment Agreement hereby is amended in its entirety so as to read as follows:

“4. Base Salary. For all services to be rendered by the Executive pursuant to this Agreement, the Companies agree to pay the Executive during the term of this agreement a base salary (the “Base Salary”) for each calendar year at an annual rate which is not less than the annual rate of the Executive’s Base Salary in effect on December 31 of the immediately preceding calendar year. The Executive’s annual incentive bonus provided for in Paragraph 5 and all other compensation and benefits to which the executive is or may become entitled pursuant to this agreement or under any plans or programs of the Companies shall be in addition to the Base Salary.”

2. Upon the execution of this Third Amendment to Employment Agreement, any subsequent reference to the Employment Agreement shall mean the Employment Agreement as amended by the First Amendment, the Second Amendment, and this Third Amendment to Employment Agreement. As amended by the First Amendment, the Second Amendment, and this Third Amendment to Employment Agreement, the Employment Agreement shall remain in full force and effect according to its terms.

IN WITNESS WHEREOF, each of the parties has caused this Third Amendment to Employment Agreement to be executed as of the date first set forth above.