Terrible service - no communication

Hi, I took out a policy in 2012 for my parents with Old Mutual Greenlight - last year I didn't make payment for 3 months - I requested revival forms after the 3 month - I sent the forms in August, the revival deadline was the 1 December - They acknowledged my forms but didn't process the revival I have been in contact with the complaints department since August till today they keep saying its a technical error they will get back to me, they stopped replying to my emails, I lose all that money I paid since 2012, no one wants to assist me, please help