Vodacom is just a **** to the society.(very dissapointed ,just wish to finish my contact with them)

I have a contract with Vodacom , and I can't wait for it to end, I am seriously disappointed in their service. I get 30GB of data daily and 30GB night owl. I had been using the wifi day and night and my data would last for up to a maximum of 28 days in a month, minimum would be 26 days (highly unlikely)but as of November my bundles run out earlier within 10 days, which I find impossible cause I use them the same way I used to before, I called Vodacom on the 17th of December to lay a complaint but they still haven't responded, my family member has the same problem with Vodacom. I have a separate contract that I have from MTN with the same bundle, but it last over 30 days, I'm tired o dropping my money on Vodacom, I want people to avoid taking contracts with them. My contract number is ***.(I WANT MY DATA BUNDLES BACK!!!!!!!!!!!)including the one from last month.