Telkom bad service

I was looking to upgrade my cellphone contract and called around to various Telkom branches in search for my desired phone. I then eventually find it successfully or so I thought at Telkom Cavendish square on Monday. The person that I'm communicating with is Nuah (not sure of spelling) she assures me that i am ready for an upgrade which she will start the paperwork and I can come in store to sign later on during the day. I arrive at the Store, Nuah is not available at present. Logan then assists me and notifies me that my contract is only due for upgrade the following day.I"m very disappointed that the incorrect information was given to me over the phone. I agree to come back 2 days later as I was not available to come back in the following day. Logan assures me that he has written my name on the box of the phone and that it is reserved for my return. On Wednesday I call the branch to speak to Logan to check whether everything is in order for when I come in for the upgrade on Thursday,which he confirms. On Thursday I come in again assisted by Logan we do all the necessary paperwork ; sign, thumb print etc ... he requests that i return to the store in 20 mins whilst he gets the phone. Whilst leaving the store he calls me to say that he has just realized that the phone had already been sold. At this point i am ****ed off ,this is very unprofessional. I end up leaving the store without a phone and being promised for a delivery . I am highly dissatisfied with the service provided, the staff clearly have communication barriers