They do Not able to complete the promised therapy session for whose payment is done by us in advance

I purchased a prepaid therapy package from Sunshine by Lissun, Pitampura, for my child Navya Aggarwal. The package was discussed and confirmed through WhatsApp on 30–31 March 2026 for 24+1 complimentary BT sessions, 24+1 complimentary OT sessions and 24+1 complimentary ST sessions, for a total payment of ₹48,600. The invoice dated 7 April 2026 confirms full payment of ₹48,600 and zero balance due. At the time of purchase, no expiry date of 30 August 2026 was communicated in the package confirmation. After purchase, I repeatedly contacted the centre to schedule pending sessions. Several sessions were affected by therapist leave, centre-related reasons and repeated rescheduling, including instances documented on 6 March, 30 April, 31 May, 3 June and 6 August. I also repeatedly requested suitable and regular slots. The number of remaining sessions communicated by the centre also varied at different times, requiring reconciliation with actual attendance records. On 19 August 2026, I was informed that the remaining sessions could not be carried forward beyond 30 August 2026, and on 22 August my therapy slots were removed. On 7 September 2026, I was informed that the remaining prepaid sessions had expired in the system and could not be scheduled. I formally complained to Sunshine by Lissun on 9 September 2026 and requested the applicable terms and conditions, proof that the expiry condition was communicated before payment, complete session-wise records and reconciliation of the remaining sessions. Despite reminders, no substantive resolution has been provided. I request restoration and scheduling of all legitimately remaining prepaid sessions. Alternatively, if the service provider is unwilling or unable to provide them, I request a refund of the unused paid portion of the package, along with appropriate relief for the inconvenience caused.