For the 5th time, please release my number

my contract expired on the 25th, I called the helpdesk before then and I was advised by Nolo that i must call after the 25th to cancel the contract and so i called on the 26th. The lady told me that this would be done and i should get a call after 24 hours to advise and they did not call me. Yesterday again I called to find out what was happening and a lady told me that they would call me within 2 hours and I am still waiting.