Credit note never passed on account

I upgraded my phone in order to save on my monthly subscription, sad to say Vodacom double charged met for November subscription twice on the old subscription and on the new package, setting my budget back by double the normal value. I sent a couple of emails without any feedback and then on 9 March 2023 I phoned customer support and explained the problem and they saw the error , promising me to put through a refund of R473.91 It is nou 4 April and I'm still waiting for this credit. This is theft!! They stole my money agreed that it was their mistake and I'm just left dry to wait it out. This is terrible customer service, and I've been a loyal Vodacom customer for 25 years and this is what I get for my loyalty.