Poor after-sale service

The beginning of December in 2019 I bought a used Mercedes Benz Vito from Toyota Melrose with help from Martin Moholola for my business. Fast forward to few weeks later, I was stuck with a car I couldn’t use because the permit expired and they couldn’t help me with a new disc all because Martin was on leave. Prior to that frustrating incident, when I got the car, I noticed the it had no booklets (service and manual) to which Martin assured me I’ll get in a few days. Bothered by his silence for few weeks I made contact with Martin and he reassured me that I’ll get the booklets soon. Between my texts, WhatsApp, phone calls and emails for few weeks nagging him about this, he never bothered to get back to me. I then called in for his manager (Rudolf Jansen Van Rensburg) who I couldn’t get hold of, but managed to get his email address. When I dropped him a mail, he assured me he’ll resolve the issue. Martin immediately sent me an email apologizing and saying he’ll attend to the matter urgently. Few weeks later they told me the booklets have been ordered with Mercedes Benz Rosebank and I should get them shortly. Lockdown came and fast forward to level 3 of lockdown, when I contacted Martin he told me CMH Toyota has been bought by a different company and when they contact Mercedes Benz they can’t find their order nor proof of payment. Since then both Rudolf and Martin have just been brushing me off every time I try to make contact. In essence, 8 months later, I still haven’t received booklets that only take a day to get from Mercedes Benz.