11 full beers in a 12 pack

My husband purchased a 12 pack of castle lager and in the 12 pack there was on empty sealed bottle. On the 16th January I sent SABS a message via their Facebook messenger platform. I called their customer careline the next day because they were closed on the public holiday. The agent I spoke to asked me for all the packaging details as I had not thrown it away yet. I attached photos on the social media platform and I kept the bottle as per the agents request. It's almost 3 months later and I've never received a call or message from SABS. The agent I spoke to said I must keep the bottle because someone from quality assurance will make contact with me and they will probably collect the bottle from me for further investigation. The fact that I haven't been called and it's almost 3 months, from such a big company! I'm disgusted SABS!