BPF Service centre LIES about servicing vehicles

Took my car in for a major service using a Hyperi voucher that specified all the services they will be rendering. upon collection of my vehicle my car was misfiring and i contacted the service centre to complain. i was told that my spark plugs were changed and that the misfiring was due to a damaged tapped cover gasket. a few days later i took my vehicle in for a checkup with a different mechanic only to find that my spark plugs were not changed and i had been **** too. i took my car back to BPF center and the Manager (Adriaan) refused to change my spark plugs. i spent a totall of R1100 for a service that wasn't even completed . i am so disappointed and disgusted by the service provided by BPF , the manager was rude and not even willing to hear me out.