After service Query

I have been requesting a proof of purchase for a laptop that I have with Vodacom now for the last couple of days. Laptop is faulty, vodacom don't fix, I have to send it away before my warranty expire. To this moment I haven't received a single proof of purchase. I took the laptop out online and I've been transferred to different people and nothing. I will never ever make the mistake of taking out a laptop with them again. After service is pathetic really!