get FULL TALKTIME & 45 day validity

i had recived SMS from reliance Dear Reliance custoner, get FULL TALKTIME & 45 day validity on EReacharge of Rs360. Full TalkTime can be used for all calls. offer ENDS 31 March.
On 30th march i reachared my account By EReacharge of Rs360. And i got talk time Rs305. i file a complent on same day & complent no. is 47436359. pls sir if you read this letter i pls. take some leagle action & Please replay me.