when companies take us customers for fools

My husband had an account with edcon and had taken a cellphone airtime contract on his 084 number. Once he was done paying the account he closed the account at one of the stores inside and even made the call to the call center to close the account. He then changed numbers as the 084 number was giving him problems which is the number was receiving the airtime from. Now for 4years he has been using the new number 079 and then suddenly we receive a statement from Edgars saying that we owe the account. To our surprise they tell us it's because of the airtime that is still being sent to the 084 number. We went to the Edgars store at Eastgate and the lady from customer services on the public holiday of May 1, workers Day made the call to the call center and asked them what was happening as she could see that the statement only started this year 2018. An investigation was to take place to see what the problem was. When the results came back they at RCS said due to the fact that the 084 number was still receiving airtime they still expect that payment. Now I'm only but concerned about my husbands credit score which could be *****ed. What kind of investigation took place that didn't go to the extent of finding out who is the current user of the 084 number and start billing that individual? If the records also prove that the account had not been receiving airtime for 4 years why start now? We will not be making any payment as we believe that all calls made to the call center are recorded so if need be lets pull that call of my husband closing the account 4years ago and the camera footage of him cutting his card in half. This is really a nightmare and really uncalled for.