Hello Rumana,
Black-brown leaf spots indicate camellia leaf spot—a fungal issue treatable with a garden-center fungicide spray. Buds forming but not opening usually means the plant is pot-bound and the compost is exhausted.
If the container isn't too large, repot entirely into fresh ericaceous compost. Otherwise, scrape away the top 3 inches of old compost and replace it. Keep the mix consistently moist (not soggy) and feed regularly with a balanced liquid fertilizer per label directions.
These steps should restore vigor and flowering.
Gill
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