diff --git a/bin/find_bad_customers b/bin/find_bad_customers
new file mode 100644
index 0000000000000000000000000000000000000000..3e552b3ecce00b8b028d86b905be5b3332364af1
--- /dev/null
+++ b/bin/find_bad_customers
@@ -0,0 +1,23 @@
+#!/usr/bin/ruby
+# frozen_string_literal: true
+
+require "redis"
+redis = Redis.new
+
+raise "GIVE ME FILE" unless ARGV[0]
+
+PORTING_NUMBERS = File.read(ARGV[0]).split("\n")
+
+redis.scan_each(match: "catapult_jid-*", count: 1000) do |key|
+	tel = key[13..-1]
+	next if PORTING_NUMBERS.include? tel
+
+	jid = redis.get(key)
+	next if jid.start_with?("customer_")
+
+	other_tel = redis.lindex("catapult_cred-#{jid}", -1)
+	next unless other_tel
+	next unless tel == other_tel
+
+	puts jid
+end