Warehouse Issues with Returns

I did an upgrade mid-February. It was a sim only upgrade, but the system decided that it was going to courier me a sim. When the courier arrived another person's parcel arrived with two cell phones in it. I returned the package immediately with the courier. Now a month later I'm still waiting for this package to be returned to the warehouse and for my upgrade to be actioned. Every time I do an upgrade with Vodacom it becomes a very difficult process. The last time it was a problem with a new system, now its a problem with the warehouse. Can I please simply have what I asked for which was a simple package upgrade.