Inadequacy of travel insurance

I've been a client of FNB for nearly 20 years. I am due for international travel for work very soon for which I took out travel insurance with TIC after purchasing my flight using an FNB card. My travels were delayed by a month and I communicated that to TIC. I was told you my policy was void because I don't have return ticket. My work contract states travels are reimbursable so I only had finances to go. The policy I took out is for the full duration as per the contract. I did not mislead or misrepresent my travels. I've tried to get assistance on what cam be done and I was just told to cancel the policy. I am receiving little to no assistance in getting appropriate travel insurance. My work contract, duration of my policy and institution is all verifiable. I understand the need for rules and regulations but I am willing and able and able to provide additional documentation to ensure I follow all the rules. Please may i get assistance as soon as possible