violent assistant

Hi I've been at this vodacom store in January to purchase a smart tab 3G, after making the purchase I asked an assistant help me with insurance on the tab so she said the don't have such insurance forms so she provided me with a number *** to get the tab insured within a 7 day period so I've been trying that never and it was always busy, it had gone more than a 7 day period trying that busy number so I decided to go back to the branch and explain what transpired, whilst getting assistance from a vodacom agent another agent walks up to me saying get off this seat now! And go to the back seat perhaps he needed his favourite customer to sit there so I agreed and went to the back, he comes back to me grabs my T-shirt and pushes me out of the store!!!!!! I'm totally frustrated with the fact that its too late for my insurance and I was treated in that way! from the date 31/01/2015 this incident happened until now vodacom hasn't responded I've always been **** to and promised by call centre agents that I will find help!!!! Please respond to the I'm done with the 3 month waiting period....