Disaapointed & angry

I have a funeral policy & life cover with old mutual whuch is one premium its deducting from persal.All of a sudden I received an email that one of the people covered has lapsed,I went to the branch to enquire about this I didn't receive any help was told they will open a case.Since then I've been calling trying to get answers but to no avail everyone keeps on telling me the same thing "send proof of payslips" of which I did everytime.The person assigned to investigate this case sent an email that shes waiting for technical team's response.Today I received an email that no premiums have been received for this policy since June and I must make a payment of R1793,my question is how when your deducting straight from the employer & my premium is R566 so that amount multip**** by 4 doesnt equal to R1793.I'm so disappointed with old mutual because they have been giving me different reasons every time I enquire about this.Seemingly they want me to loose on this policy.I have never missed on any payments in this past nine to ten years of gaving it & ever since they've been deducting from persal.