They make a mess on my policy and now they don’t bother to correct

***x01 I had requested the plan to be increased by 150, they swnd. Me wrong form that say decrease by 150 , i sent email and i phoned telling them .the agent said the forms are correct i must send them. I filled the form and i wrote on the form that i want premium increase not decrease. Only to find in april they decrease. I phoned telling them , i ask for a manager they refuse they said it will be sorted in 14 day, i would phone evey week they kept giving different information every time , now it the now the swcond month, when i phone it not done but they don’t want to escalate to supervisor,and they don’t want me to speak to someone handling it, my payslip closes tomorrow that mean now it to e second month of these nonsense