Heidelberg Mall Vodacom really bad service

Vodacom in Heidelberg Mall is so pathetic. I took out a data contract with them and within 4days Vodacom took 50gigs of our data. We question it with Vodacom call centre 5days after signing our contract and they cannot provide me with a solid answer and just credit my number with 20gig. I call Vodacom in Heidelberg mall and explain everything and they never call back. Eventually after you have to get rude they call back and ask me to bring the device in and all devices that i use to connect to the data. they go through my phones and my work laptop and nothing warrants the 50gig depletion. The guy goes through the data usage Vodacom sent me and confirms nothing makes sense and confirms that i did not use 50gig. They take my device after they speak to someone over the phone and confirm that they will cancel the contract. This was after 6days of signing the contract. They gave me a letter and confirmed that they will process the cancellation and it will take 2 days so after 3days i call back and the manager now all of a sudden says i need to call the cancelation line and will be penalized. And when i tell her that Vodacom in essence stole my data and my money because they have the device she has the audacity to sigh and say ‘oh my God’ and then when i say she better sort it out she sighs. Only when you threaten so sue the store does she say she will escalate the matter. There is no understanding and no empathy for the fact that they take a device back, ***** your data and then confirm they will process a cancellation and then when you want feedback they want to make as-if you are bothering them. They are so quick to take your money but when you have an issue Lord you better hope you did not go through the Vodacom in Heidelberg Mall