Oh dear!! Hope you get that sorted.
We have ordered two recently. One arrived and comfortable so far. The other will arrive in the new year, will now need to keep an eye on it!
Which model did you go for?
We have had a rolled mattress before which has lasted several years so not sure all are bad. Would think simba wouldn’t be doing so well if this was a consistent thing but you would be very unlucky for it to have been a bad one twice!