Unhappy with the service recieved

We bought the parts of Citroen c VTR order nr 237040 at Cutroen Nelspruit in the beginning of December 2015 since then every time when we follow up we are being send from pillar to post today I phone Citroen customer service in jhb and spoke to Kevin who promised me to phone me back and I was only phone by Gernine customer service who told me she will invoice the stock next week Tuesday I would like to express my my disappointment on this product's and the service recieved from nelspruit and Johannesburg Citrioen as a brand I am not happy at all I wish someone can change this and let them start taking us customer serious as when they sell the cars to us they don't say we are going to get bad service when you want the parts it was even better if we didn't pay for the parts now the is fully paid.