Thank you for using Logitech's Electronic Technical Support. My name is Sai. The following information addresses your original question. You may wish to print this out and/or save this on your computer.
 
We sincerely apologize for the issue you are experiencing with your Logitech product.  At this point, we recommend you to get your device replaced.  
 
We would like to ensure your satisfaction by replacing your device while covered under our manufacturer?s warranty period.  Due to the nature of product exchanges, we will require that you contact the Logitech Customer Support HotLine to receive a Return Merchandise Authorization (RMA) number. Unfortunately, we cannot provide this number through the Electronic Technical
Support (e-mail) system.  
 
To obtain your RMA number, please contact our Customer Support Hotline at 702-269-3457.  Our Technical Support Agents can be reached Monday through Friday from 7:00 AM to 5:00 PM PST (Excluding Some Holidays).
 
Please note that some issues will require general troubleshooting to be performed by the agent.  To save you time, please ensure that your device is installed and the issue is present.  
 
You will want to be at your system and have the following pieces of information readily available when you call:  
(1) Model number or Part number of the Logitech product  
 
Please note that warranty is determined by the product serial number or a proof of purchase (receipt). Therefore, it is important that you have the product and/or receipt with you when you call. Failure to provide us with any of the information may impede the speed of fulfilling your request.  
 
If your product is out of warranty, you may be able to replace it after paying an out of warranty charge.
 
If you live outside the U.S. or Canada please refer to the following URL to locate the Logitech support center closest to you: http://www.logitech.com/index.cfm? [...] nguageid=1
 
If you have additional technical questions regarding this issue, please reply to this email.
 
If you have questions regarding another issue with your product, or questions regarding another product, please visit our web site at www.logitech.com and submit your question.
 
 
Thank you for your interest in Logitech.
 
 
Regards,
Sai
Logitech Customer Support

Hi, the MX 700 Mouse provided in my MX Duo has issues with the silver coating of the left and right buttons.
 
The coating seems to wear off, leaving 2 dark stains near where the fingers usualy take place.
 
This mouse is not even 2 months old and I really question the quality of this product. I've had several other Logitech products and it's the 1st time it ever happens.
 
It like to know if something can be done about this, as this  
troublesome esthetic problem is even more enhenced due to the fact that the mouse is often "standing up" in it's socket on my desk.