Since you are dissatisfied with TVS' aftersales experience, we would recommend you take a look at scooters from Japanese brands.
Options like the Suzuki Access, Honda Activa 110 / 125 and Yamaha RayZR / Fascino Hybrid models have cemented their reputation for reliability, easy spare parts availability (especially so for the Activa and Access) and low running costs.
These scooters are also comfortable, practical and quite fuel efficient, so picking between them will boil down to which one you prefer personally. A test ride of all these should help you make a decision.
