Nissan South Africa after sales service

Purchased a new vehicle 3 years with a Service Plan offered by the Nissan Dealership in question. (name not mentioned because of the outstanding service received by them). I cannot recall the length of my Service Plan and called Nissan South Africa to obtain this information. 1st Call Tuesday 8 January 2019, 2 days later no return call from Nissan SA. Follow up call made 10 January and spoke to a Marko Stander who politely advised me Nissan SA does not have any record of my service plan and Avis is apparently the contractor for Nissan Service Plans. If Nissan SA does not know who is contracted to them when it comes to Service Plans. As a customer who was happy to make another purchase through Nissan, that idea is now a very, very distant thought to rather not. I requested the above from Marko to trace and follow up. I guess my request has now ended up like my service plan MISSING IN ACTION and no record of it.