A transient ischaemic attack is defined as a focal deficit that completely resolves under 24 hours. If the symptoms persisted for more than 24 hours then by definition this is a stroke.
If you have had a CT that shows a persistent infarct damage that has left you with a neurological problem such as weakness, paralysis or speech deficit then this is a stroke and therefore you would be covered.
How is your health at the moment?
The fact that you still have symptoms means that this is not a TIA and your consultant will be able to verify that. He/she will also be able to confirm that the extent of yur disability affects your ability to return to full time work.
If your insurance company seems to be ackward upon this issue then insist on an appointment with one of their doctors who will be able to do tests in the examination room to confirm these findings.