Im looking for Accurate Skiptracing, can anyone help??

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I’m a wholesaler who does direct mail and cold calling but I prefer the cold calling method as it is quicker and more convenient if I have an accurate method of obtaining current vital info. Currently I use Intelius to pull numbers and relatives numbers but honestly more than 60 percent of the numbers are incorrect and it’s getting frustrating. What is the best way to skip trace? Which programs are the best? Also can I search in bulk? I feel like knowing this can help move my wholesaling business in the right direction. Thank you BP community.