COLLECTION REQUEST REFF : ***2

After agreeing to upgrade my existing cell phone number to an Iphone 6 - on receipt of the phone by courier while activating the sim card it was discovered that the lady helping me had supp**** a new number instead of having done an upgrade. The phone was delivered to me on the 24th April. The next day I went in to the Vodacom branch at Blue route and the did an upgrade for me and I was advised that the previous phone would be collected Since them I have made 5 phone calls, one online chat and 4 emails to Vodacom to try to establish when the previous phone would be collected but to no avail. All this after being a Vodacom customer for more than 10 years .. what to do ?