Nowadays I ask Accuchek (different from yours), for different batch numbers for every order (for example if I ask for 4 boxes-I ask that they are all different batch munbers) so if I find problems with a box of rapid ds- I know that I can try another batch number.
Personally from my experience I would notify manufacturer and DSN immediately and ask for rpelacements. They should ask for the sets back to test....and send you labels etc to send them back FOC. I would ask DSN if she has any spares to tide you over until new batch numbers arrive...and would specifically explain problems to manufacturer AND make sure I had different batch numbers.