How should a franchise respond to a food poisoning complaint?

[ChetChet]

Just this really.
I've finally received an email from the franchise owner after I contacted customer service about a recent bad order. The feel I get from reading the email is, "Customer service told me to contact you. I hear you got sick, sorry about that. See you again soon!".
To me, the tone is off but perhaps I am expecting a bit more sincerity..? Goodness, I was fully clothed, under my weighted blanket last week during the heatwave, shivering with cold and vomiting and ahem, on the loo all day. One child suffered with diarrhoea and another was also sick.
Regardless of that, I can't help but feel his reply has not addressed my complaint but am thinking too much on this?
I've never dealt with a food poisoning complaint before.

You can still ask the GP to check a stool sample.

It hangs around for a long time, for example if salmonella.

Sounds like staphylococcus aureus which most certainly can start within an hour. It's usually caused by toxins which in affect are the remnants of dead bacteria.
Staph sounds like staff which we were always told how to remember it, so it comes from poor hygiene. Dirty hands etc.
I worked in the food industry for over 30 years and food hygiene was very much part of my job.

Sorry, forgot to say....
Definitely worth reporting to the council so hygiene and staff training can be checked.
Things change and staff change.

Sounds like staphylococcus aureus which most certainly can start within an hour.

You don't have any evidence to support this! Even the OP has acknowledged the food may not be the cause.

that does NOT sound like food poisoning!!

why are people so quick to blame and ring in to customer services....your feelings were hurt op? why? because they weren't falling over themselves to reimburse/send vouchers/whatever you wanted?

there were 5 people there eating too

The whole food industry involves checks and inspections.
If you report exactly what happened and how you all felt, then experienced EHOs can decide if they need to visit.
They'll also know if they've had any other reports.
I don't suppose the restaurant will bat an eyelid as that's part of running a food business.
It's not like they should be worried about being caught not following food law because they should always be following food law.