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They must have a series of 636-204 numbers they use to constantly call people. This is not the only 636-204 number I have reported as spam.
Receiving unwanted or harrassing calls from (636) 204-6503? Report It! You can also add your number to the National DO Not Call Registry by visiting their website or calling (888) 382-1222, but many people have complained about it not being effective. If there is something requiring an immediate attention, please contact your local law enforcement agency or call 911.