Hi XXXXXXXXXX;
About the only thing you can do is disassemble the unit and replace the pull chain.
This is not a difficult task for a DIYer, but they do need a basic grasp of household electrial and electrical theory. eg; what is the common color codeing for a hot wire, neutral, earth ground, and secondairy hot wires. Use of a test meter, and proper safety practises when working with live electrical wires.
The pull chain is available from Radio Shack for about 3 bucks.
Best, THS
Jack of all trades Master of a few.
#1 Home Improvement Expert. Over 30 years experience in construction, and home repairs