Pay back the money

I feel like I'm in an abusive relationship with a golddigger and that I have a joint account with, I've come to a realization that I share my bank account with miway coz they clearly take whatever they want, when then want,

I had a policy with myway n car 1 was insured with them for over a year, called them to inform them that I've sold car one and need to replace it with car 2. You pay in advance with insurance so I was due for a refund of R622. I needed to pay a pro rata amount for car 2 at 600. So it's simple, I pay them with my refund and they credit me the 22 rand on my next debit. No one owes anyone. Boom R600 is deducted from my account. I call them and enquire what's going on, I'm informed that this is for the pro rata payment for car 2. I explain that we had a deal, how can you take money from me when u owe me? Whats the logic? I'm told that I will be credited my refund on my next premium. ???? so I'm like thanks but no thanks, cancel my policy. Keep the pro rata premium for car 2 but return my refund.

What happens next is messed up, the premium for the cancelled policy is deducted plus an additional R160 for God knows what and I still haven't received my refund.

As per refund policy I've emailed bank statements but no one has got bk to me.

I want my money back please. I would like to separate on good terms for the sake of the children ?