rear shock absorbers replaced, car now too low

I just had both front and back shock absorbers and springs replaced, Bilsten shocks and spings - all standard.  Drove the car on Sunday with adult passengers in the rear and some shopping in the boot - car now hitting the tyre at the rear drivers side on every dip and bump in the road.

the springs seem very springy - not sure how else to say it.  I have checked with Bilsten and they say the parts are correct.  Any ideas what to do next apart from re-fit with new parts?

I have had the car for 23 years, always carried passengers,/loads - beginning to wish I had left it alone!

Check the length of the original springs, the number of coils, the diameter of the spring wire and compare with the new ones. It's the only way to check.
Sounds as though the new springs are incorrect in some way, so compare with the original ones you took off.
Either that or the shocks are for a lowered car and the bump stops aren't doing their job properly

Thank you.  The shocks are the right ones.  I have checked the old springs - they are both different!

I just wondered what make/model others use for their Cabriolet springs if they don't want to lower them

Bilstein should be among the best available. Have you checked the catalogue numbers of the parts you were supplied against Bilstein's online catalogue - at the following link?

Passenger car

 I have checked the old springs - they are both different!

You must somehow have got the wrong springs?

In what way are they different, different length different number of coils, different wire diameter?
This is obviously the source of your problem. The make of spring is irrelevant, what is important is you have the wrong ones fitted.