Cancellation not processed timeously

As a former Autopage client, I had to wait to cancel my contract which had been given over to Glocell. In terms of my contract, I submitted my cancellation form to Glocell's customer service department on the 31 March 2016, giving them 1 months notice as my contract expired on the 30 April 2016. I had requested to port my number across to another service provider aswell. I have received ticket numbers and emails confirming receipt of my emails. I also eventually phoned your call centre on the 02 April 2016 to find out whether anyone actually actioned my cancellation request. I was told by your agents that it was submitted to your Head Office, however Glocell was experiencing a high volume of calls and cancellations (no surprise) and it would be dealt with during the course of the month (Pull the recorded call if need be) I phoned the customer service department on the 02 May 2016 to enquire as to why my data and minutes had been reloaded. I was then informed that their Head Office only received the cancellation on the 16 April 2016, and I will have to wait for 16 May 2016 for my cancellation, therefore I would have to pay for another 16 days. So, Glocell, the fact that you failed to action my cancellation on the day it was submitted (31 March 2016), is not my problem. Your lack of even pathetic service is no surprise to me, and I cannot believe that a company cannot process information timeously and accurately. Surely, if my cancellation is dated 30 April 2016, and my email is proof that I submitted my cancellation on the 31 March 2016, you would load the cancellation date accordingly? I have been on hold for 40 minutes this morning with your call centre, and cannot afford the excessive bill thereof. I expect feedback within 24 hours to confirm that my cancellation has been processed, and that my account will not be debited for any extra costs due to negligence on your part. I expect an amicable solution and reply to this complaint.