Vodacom online customer service has the worst service ever!!!!

I purchased a router on vodacom and I told the consultant what I was looking for and I was sent the small pocket router which isn't what I wanted and I then returned it 2days later on the first week of March and I've been calling trying to get another bigger router the one I initially wanted and I was told my profile is still active showing that I still have the other router which I returned and for 3 consecutive days I was told the agent that helped me first time around will contact me and I'm still waiting... Today I received an invoice of R453 for a router I don't even have No way I'm paying for something Ive never even used...