Vodacom must take charge as I have a contract with them and not that I must take my laptop myself to Proline.

I bought a Laptop Proline V146ENV at Vodacom by contract in January at Heidelburg Mall.Now my laptop is not charging, I took it to Nigel and they try to help me but they where told that no repairs Proline are done there the only thing that I must do is to take my laptop to Midrand Proline head office 261 16th Rendjespark. My question is why can't Vodacom take charge as I have a contract with them and not Proline? Please help me I need to us my laptop Yours M.J.Motsiri