Never try and stop a fermentation by adding anything other then another alc like you would do when making a port by over coming the yeasts tolerance of abv. or by just throwing it into very cold weather to cold crash it but this method here isnt advised too much as it can fail and start fermenting all over agin if not sterile filtered and stabilized before subjecting it to warmer temps again. Using any other method will just result in stressing the yeast and creating off smells and flavors undesireable to your wine. What is the temp and g of your wine right now and what was the starting sg and yeast used?