Vodacom please refund my money

So disappointed with Vodacom services, i paid R16000 instead of R1600 by mistake and contacted them immediately after i realized the mistake, i was transferred from pillar to post eventually got through and gave all that was was needed to process the refund which they claim is 7 to 14 days working,

They have been quite no updates until i sent them an email on day 9 working days only to get a response that they are following up with the refund approval i mean what is taking so long if all what is need was submitted immediately and they confirmed that the money was show on their side?

Very poor service and i have been with the service provider for over 20 years i think its time one move to another service provider i had enough.