Vodacom misinformation

My phone was ****** late afternoon on 28 September. Long story short, I had to rush to Vodacom Tygervalley to do a sim swop and blacklist the phone. I've had a second Vodacom for many years for wifi, the sim card is in a ****le and I had a top contract. The agent suggested that I get a phone on that contract but he did not explain that I will be losing my wifi data! Yesterday I had 28GB left, I woke up this morning with 625MG and cannot work at all. VERY VERY disappointed in Vodacom. I have been a client of theirs since 1994 and now I'm stuck.