Unacceptable service

End of February, I paid my monthly premium to Vodacom and the very next day they did a deduction as well. When I phoned in, they told me that they would refund me and that I just needed to send proof of payment. On the 2nd of March, I sent through my POP to the e-mail address provided by agent. I received a customer care notification stating receipt of mail. On the 9th of March, I sent a follow up e-mail, once again receiving a customer care notification of receipt of mail. When I phoned in yesterday, the agent stated that they need the Proof of Payment, which was sent twice and that I need to wait another 7 days for refund (after already waiting 10 days). I asked to speak to Manager and spoke to Team Leader. Once again forwarded my mail and attachment with no feedback from him. This is UNACCEPTABLE, I need my monies to be paid back to me ASAP! I will be posting on social media as Vodacom's service is poor.