Full reset process to try:
1. Go to your Smart TV Settings → Apps → find the IPTV app → Storage → Clear Data (not just cache, but ALL data).
2. Restart the TV completely (power off at wall for 30 seconds).
3. Reopen the app and note the MAC address shown on startup — compare with what you sent the provider.
4. If MAC is different, contact provider support with the new MAC.
5. If MAC is same, try reinstalling the app completely.