Upgrade to down grade

On Thursday 24 February when I logged on to my Vodacom account it informed me that i was due for an Upgrade. So I clicked on the deals they selected. All of which were in fact for phones that dont compare to what I have . So then I decided to check what I wanted and selected a samsung s6 on what I thought was the smart S package which included a extra 800mb per month. Since they have two packages the Smart M within the R549 range I selected that one accidentally when i did the upgrade. After a consultant called me this afternoon I realised my mistake. So stupidly I contacted Vodacom to see since I actually haven't received the phone if I could change. No was the reply because its been invoiced? So my option is to return the phone when it arrives which I assume i will be charged for or accept the smart phone on a contract with 300mb. Gee I will be able to use for a week a month if Im lucky. I honestly don't have the time or energy to deal with Vodacom and God only knows what will happen if I return the phone. So I will just accept it and in 2 years move along to Cell C who actually give value for money. Lesson learnt. Thank you so much.