For ‘best practices’ companies often have an unsubscribe and/or an ‘update marketing preferences’.
@grahroll’s advice seems your best mechanism to get it stopped as you are a)not their customer and b)do not wish to become their customer.
However a single acknowledgement email is not spam since it relates specifically to a SIM shipment you instigated and if you think about that, you probably want to receive that kind of message. Looking at it from a practical viewpoint you should want to know a SIM was sent so you would expect it, and even chase it up if it went missing. Consider if the latter, and a miscreant received it they could try to activate it hoping you had an account so it could (in theory) become a privacy and security matter.
Sometimes ‘the system’ is not amenable to being easy or responsive so your other option to avoid seeing the unwanted communications - if it persists for more than say a month - is to complain to ACMA and also make an email filter as was described in your topic about temu to mark it as spam and delete it.
Although I cannot comment on Dodo’s customer service you could also ring them in an otherwise idle moment and ask them to stop sending emails because you are not a customer and have decided you are not going to become one. It might be another month before all related emails are out of their system and your inbox is left without Dodo solicitations and information you do not wish to receive.
