Bad Service

I had booked my car for a service, my motor plan expires on 16th June 2021, The motorplan says 100,000 or 5 years, my kilometers is 98,200 and they say it can be serviced because it is not yet 105 000, can they explain to me if I have a contract ending at 100,000 why should it be 105,000. Regardless when I serviced last, that was in nov 2020. Due to covid most of us are not working and travelling, so we have not been able to put kms, but mercedes is adamant it is not their problem. I think no matter how great a brand is, if they cant accomodate a customer, then thier brand stinks. I will never ever buy a mercedes in my life ever again in south africa. Mercedes Ref No ***. dated 14 Jun 2021. Customer service agent, Mandy talks like a computer, she need to be trained better everything needs to be checked back by someone else because every question you ask, she puts you on hold to go back get answers.