Woolworths CVV issue !

After many years of being a loyal customer, using the same store card for as many years, I am unable to use it on the mobile app as suddenly the cvv number is incorrect... How - What - Why ? Well nobody at Woolworths has been able to answer me except for - "please use your card 3 times in store before using it online- OMW how many times do I need to repeat that I've had this card for years ? I'm sorry Woolies you've left me no choice but to give you a bad review ... because after 3 months I'm still waiting for my problem to be resolved! Maybe ... just maybe ... I'll get to the bottom of this and it will be resolved !