Antenatal classes?

Panda
I've visited a few different midwives so far in this pregnancy and every single one has tried pushing me to take up antenatal classes. At first I thought it's a nice offer but no thanks, I told my midwife I wasn't interested. After the appointment I received a few calls from other doctors/midwives trying to persuade me to take up these classes! Then when I went back to the midwife I told her again, I'm really not interested and there's nothing that will change my mind. But they keep pushing!! This is my first baby and I have heard it can be quite informative and is a good place to make friends for you and your baby. But with moving house at the moment , I'm very busy, even the doctor appointments can be a struggle to fit in! 
I know for a fact they're not mandatory but other than telling my different midwives every time that I am not interested, what else is there I can do? 
Has anyone else had a similar situation, being nagged at even though you've said no? 
I appreciate the offer but when will they accept that I don't want to go!