vehicle repair and body

We paid this guys named hendrik wessels R11000 to repair and respray our nissan hard body dubble cap bakkie. We struggled 4 months to get the vehicle back after the payment has been done. They used the money but they didn't start the bakkie yet. We went to collect the vehicle and now they say we didn't pay them... the shop is allocated in pretoria north 560 brits street. Please call me back asap jacques *** or gerrie ***