Crazy waiting time to get an airport tax reimbursed

In january I had one of my frequent trips across Europe and when I arrived at the checkin desk to fly back home it turned out that the travel agency had my ticket wrong.
I paid for a new one.

Once home I checked my written request to the travel agency and it was for the correct day.
I started asking back to the travel agency the extra money I paid.

After 8 months I finally got reimbursed, but only the airport taxes from the airline: 34.95€
No surcharges, no actual ticket reimbursed.
I wonder if this is common practice.