BSNL MP — Lost Of Balance

My Pre Paid Mobile no. [protected]. Many times I found that my Balance amount lost without any reason. My age is about 70years so I write down that on 10/02/10 I recharge my cell with TopUp of 110 ang got Balance 100. But after two days my balance was zero rupee. On 12/2/10 I recharge with 55 then after some time my balance was 00.00. On 13/02/10 I recharge with 110 got balance 100. I made only 2 outgoing calls of 2 or 3 minits but after some time I was on 00.00. On 14/02/10 I again recharge with 55 and got balance of Rs. 50 but making after only 4 call I was agian on 00.00.
When I contact to Custmer Care 24365 after a lot of try i was able to contact them. They say you make call on a number about 300 seconds The number is [protected]. But I never dial this number.
What should I do to take my balance again.