Not attending to queries, now no cellphone number

We were on a Smart S package that was upgraded in November 2015. All of a sudden we received sms'es stating that we will be migrated to the flexi 150 package. We then contacted Vodacom to find out what was happening and they told us; at the time of the upgrade, the wrong upgrade was done by them. The call was made on the 31/03/2015 and a service request number was allocated to us and they indicated that they will contact in 2 days to resolve the matter. The 2 days came and went and nobody contacted us. We contacted them again after 5 days and they told us that they billed us incorrectly, we paid too much on the Smart S because we supposed to be on the FLexi 150 and they will refund us. A new service request number was allocated and they again indicated they will get back in 2 days. On the 13/04/16 we received an sms stating that Simon Maleho will contact us to resolve the matter. To date Vodacom didn't contact us and we decided to phone them to find out what was going on. To our surprise, the query was not resolved and instead the cell number is now deleted from the network. We tried to get answers...NOTHING. NO FEEDBACK... NOTHING. NO CELLPHONE NUMBER ANYMORE...