A onesided decision from absa prevents me from getting a refund from virseker

Because i wanted to leave absa property insurance, i had to first provide a replacement policy that absa approved. Done that and after long strugles and time to ammend the new policy to absa requirements. During this time i paid for the absa as well as the vir seker policy. The agreement whith the two insurers was, that both would refund me half of the premuims paid while double insured. Absa did do it and refunded their half to me. Also cancelled the policy backdated to to the start date of the vir seker policy. Vir seker wanted a policy schedule as proof that i was also insured with absa. Absa could not give such a schedule because they claim the policy was cancelled. I then presented vir seker with the proof of payment of the absa policy instead. Vir seker would not refund their half of the payments because i could not get a shedule of insurance. NOW, BECAUSE ABSA ONE SIDEDLY CANCELLED MY INSURANCE (BACK DATED) VIR SEKER IS USING THAT TO AVOID PAYING THEIR HALF OF THE PREMUIMS BACK!!!