Travel Agent Air Ticket Precaution

Hi guys

I booked an international air ticket on SQ through a travel agent.

After I paid the amount through Credit Card, for some reason the agent wasn't issuing the ticket. I had to hassle for 3 days and number of phone calls and email to finally get the ticket issued.

I called SQ to double check that everything was alright and it seems it's OK so far.

Is there anything else I can do - there are still 3 months for us to travel and I am just suspicious of why he wasn't issuing ticket!

Any ideas?