Thank you for writing.
I tried to reproduce the issue you have described with the export to excel, but I was unable to. I would kindly ask you to send me an example project where you are able to reproduce the issue so I can investigate it further.
On the export to CSV the quotations are used to enclose values. Because the CSV uses a special symbol to separate values there must be a way to tell the difference between a comma separating values and a comma that is part of a value. We have already added a feature request for adding a property allowing quotes to be turned off as per your request from the previous support ticket. We will try to include this feature in our next major release. For the time being, you can use the workaround provided by my colleague.
Looking forward to your reply regarding the issue you are experiencing with export to Excel.
the Telerik team