Still waiting for the sink waste strainer that should be included in the kitchen sink

I bought a Franke kitchen sink from CTM online store. Paarden Island branch did the actual order. The online advert says the sink includes the waste strainer and so does the invoice. When they delivered the goods, the delivery guy was extremely pushy to get me to sign the documents so he could leave. The waste strainer was missing. I phoned CTM afterwards and they said they would look into it, it is now more than a week later and nothing. I am sitting here with a sink I cannot use. I have been a regular customer of CTM for many years. I probably spent upwards of R100k at their stores in the last 7 years, really disappointed.