Mts — Data balance not carry forward

My Data Card No. is [protected]. On 5th dec morning my data balance was 5GB and validity date also 5th dec, I recharge with Rs 248 on 5th dec. but my 5GB data balance not carry forward. then i register a complain "DEC/792" and company member said my validity date was 4th dec, but i see that the validity date was 5th dec because on 5th dec morning i have 5GB balance. And when this Fact i told them, then they register another complain which is "DEC/1017". and till now my 5GB data balance not return. Please resolve my problem urgently.