Beyond pathetic service

More than two weeks ago, i went to Vodacom4U in Cape Gate Mall to apply for a contract. I had completed an application form and told the sales consultant that i had a contract by Vodacom before but it had been cancelled once it had been finished. I had given her my new cellphone number, as my previous phone had been ******. She went and processed my contract on my OLD cellphone number! I was then told that changing a simcard from pre-paid to contract may take a little longer to process. The next day i had to phone to follow up as to what was happening. So it continued to another two days, where i had to phone her to follow up. I eventually got fed-up and cancelled my contract with them. I then went to apply at another store for a contract, only to find out my contract was processed on the old number. Due to her mistake, i am now blocked from the system. It is currently going onto the third week and Vodacom customer care says that there is nothing they can do to help me. The new store is struggling for how long to clear my name, how much longer must i wait?! How can customer care take more than two weeks to change a cellphone number on their system? Now i must struggle due to someone else's mistake. I feel like i should cancel this contract as well and go to a new service provider that will actually help me!