Comcast engaging in fraudulent behavior to retain customers

I have now attempted to cancel my xfinity internet service two times over the last several weeks, each time receiving a cancellation confirmation number, to only have my account remain active with continued charges and billing. Each time I call to address this, the representative can not find the cancellation # in the system and re-directs me to the same off shore retention specialist center to repeat the entire process with zero results. There is no conceivable way that this is a one time incident, with multiple similar stories thru these forums. Comcast is knowingly engaging in predatory practices to maximize profit at the expense of their customers. Either that or the call center employees are knowingly not submitting the cancellation to mitigate the negative impact on their quotas. Either way, it is corporate crime disguised as mere incompetence.