Don't bother relying on their word - or guarantees

We bought almost all our appliances from the Milnerton store when we redid our kitchen. Certainly won't use them again. We were given assurances by the salesman when he sold us the extended warranty that if parts ever became an issue - the appliance would be replaced. Hirsch collected our washing machine four weeks ago - since then - zero communication initiated by them. I phoned two weeks ago - and was transferred to someone who couldn't help me - he promised I would be phoned back - I wasn't. I emailed their central enquiries address, they forwarded to the store - who had someone SMS me saying they were waiting for parts, due to arrive that Thursday - that was two weeks ago. Again - no communication from them, a month later. How do we go about getting our appliance back in a repaired state? We cannot wait indefinitely - and your service is too poor to actually communicate. Maintenance contract 241038. The invoice number ***. The receipt number ***.