Verizon review: fraud overbilling

I was tired of paying too much for my cell phone service, I was paying $43.15 per month just to make and receive calls. no text and no data. I waited until my contract expired with Verizon and contacted customer service. I paid all outstanding balances due and was told that when I ported my number out I would only have to pay a pro-rated amount equal to the amount of days I used the verizon service after the billing cycle date. I then ported out the phoner number to a different carrier and contacted verizon to insure my account had been closed. The customer service rep confirmed the accoun was closed and my balance woulod only be for the three or four days I had used the service (Between the billing date and my contract expiration date). I was also told that Verizon would send the pro-rated bill when the cycle was completed. I then tried to log into my "Myverizon.com" account and was told that I no longer had access to the account because I had closed it. About a month and a half passed when I received a call from verizon. They told me I owed them for a full months' service $43.15. I was shocked and explained the situation and inquired why the bill was for a full month. The customer service rep stated that Verizon had to keep the service open for the entire month to ensure the ported number worked. I informed her of my previous contacts with Verizon and that the service was paid in full up to the final billing date, and that I expected only a pro-rated bill for 3 of 4 days somewhere between $5.00 and $10.00. She then stated that the bill was for the previous months' service. not for the pro-rated month. I then explained again that my phone service had been paid up to date when I cancelled the service. She then again stated when Verizon received the payment and said it didn't include the final month. I then agsin stated my conversation with the original customer service rep and that my account was paid in full up to the payment date, there was no balance. and I was told I would only be billed for the 4 days I continued to use the Verizon service. She again stated that the charges were valid and she would send me a billing statement to verify the charges. I stated she could send me whatever she wanted, I disagreed with the charges, I thought it was a scam, I wasn't going to pay the charges and that Verizon would have to sue me to get me to pay that amount. I then hung up the phone... I haven't yet received any additional information I will follow up this complaint with additional information as it becomes available.