Disappointed with Sanlam Sky

I am truly disappointed with Sanlam Sky after being with them for more than 15years. I took out a policy to cover my Dad and Mother in law and premiums were being debited, Fast forward I then retired and I changed banks of which in the mean time I was making cash deposits for the premiums then Sanalm had the correct bank details and debited in December 2018 and January 2019 then in February 2019 they did not debit, so I went to ask why and they told me that the policy has lapsed. After paying premiums for so many years and keep in mind my dad and mother in law are above 86 years of age now. So I am really just devastated now