Unethical company

I've never been treated so badly by a company ever. At the start it was all great until I saw their true colours. I was basically retrenched after not agreeing to sign a document that compromised my labour rights during lockdown. The retrenchment process was horrible as well (they didn't even give me a proper 1 month notice, they also did not want to pay my severance package - all this is in writing) but they did end up paying it. When it was my last day I did a handover of everything (the storage unit key with its contents and the office assets - my work laptop still had all my company documents on. Almost 2 months after being retrenched I get a message from one of the employees asking me to send weights and dimensions of the stuff in the storage unit etc and that he was advised by HR to ask me. Like how am I supposed to do this when I have been retrenched and did the handover? So now today (about 4 months after being retrenched) I get a call from HR asking me about my promoter database. I still told HR that I sent it to my then promotions manager but since then my promotions manager has been retrenched and then rehired and retrenched again. Then I was asked to forward the database to HR (keep in mind I do not have access to my work emails since I no longer work there) then I still told HR that all my work documents are on the work laptop that I gave back, unless they wiped the computer clean without looking what was on there (which would be silly if they did). The audacity to ask me these things after how they treated me during my retrenchment process and how they treated me during lockdown, after working there for 2 years. FYI I'm not the only employee the mistreated.