Such bad service :(

I changed from my employers capacity to my own capacity however Discovery did not action it so was without cover for a month , only realized it when an amount of R900 odd was taken off by Virgin active , when its supposed to be R370 odd. Phoned Discovery who reinstated me from 1st Oct 2017

So i have Vitality , and yet again for this month R900 was taken off .. when i phone Vitality they say its Virgins problem and visa versa

So who is to blame for this and when do i get the money owed back to me?