Bad Customer Service and Failure to respond to customer concerns

I bought a car in January 2022 at Nissan Automall in East London and they officered some extras, AUTOCARE TYRE AND RIM PROTECTION PLAN and

AUTOCARE BODYLINE MAINTENANCE PLAN and a CRYSTAL FUSION PLAN, later through the contract i realized they are useless. Then I requested cancellation, from last year around July/August.

Also, I learned that they were supposed to give me a seat guard but I never received it, asked for it but still.

I have not been getting help since then