Hendrik's Accessible Transport operates an accessible taxi service as well as having wheel-chair accessible vehicles available for hire. From the iWheeltravel blog:
Wheelchair accessible taxis: the taxi company¬†Hendriks is specialised in disabled people transportation. I used their services twice and everything went great. Here are their phone number and email address:¬†0032 2 752.98.00 et¬†email@example.com .