Mothers burial

I lost my mother 2 weeks ago @ Cape Town and my aunt covered her with Avbob mutual society. We visited their office in Ford Beaufort last week and twice this week to decide for my mother’s burial tomorrow, to our surprise we must pay additional R30.000 which was not communicated to us from the first discussion when we visited the branch. Apparently, they forgot to mention to us transportation from Cape Town to King Williams Town. Now they want to downgrade coffin to the lowest option they have to recover their R30 000 which was not discussed with us before. The lady helping us is Nokubonga and she says it’s unfortunate they can help us today and everything is planned for burial tomorrow morning. I’m frustrated, in pain and helpless with the situation cause the only top up we agreed with them was for R13000 which we have and now they wand additional R30000. Our family is waiting for my mom to arrive today at home and now we get such news which was not communicated with us in the beginning. I don’t know what to do and need someone assistance. As a family we are highly disappointed with Avbob and we use to value them more as we thought they are a reputable funeral undertaker. How do I go back home and tell my family we have to cancel tomorrow’s burial?????