if you dont want them to call tell them you got a tattoo, or a piercing. They will stop calling since u cant give for a year. However, if you do go to try and give blood/plateletts they dont say anything u told these outside people you got a tatoo
i have a better idea..go give blood every other month and they won't bother you! They are low...especially if you have O negative blood, it can be given to every one. Give.. some day you may need it..and if every one gave, it will always be there!