Credit not passed

I logged on HP and I was contacted by the lady Gabi ( if not mistaken) on 18/12/18 with feedback.

She advised that she did listen to the call recording and I was not advised on the handset that i was billed for on the December invoice and that my Vodacom account will be credited with about R400.

When checking on the app the credit has not been passed, it show that i will pay R599 end of January.

Please confirm if the request for the credit was sent as promised, if not how long is it going take for it be done