Wow Cinta, that is extreme. It must be very frustrating.
No deer here, but a lot of rabbits. I have read several articles that all say it is more effective if you rotate your repellant products. Apparently they get used to one or another and begin to ignore it. I think that is true. I used one granular product for quite awhile and it worked very well, but then I started to see damage again. Then I started to switch off with that and another different product after it rained or whatever and have had less issues.