Inaccurate data balance

I am so frustrated as I am not getting any assistance from rain they loaded my data I have Sim 1 that's the main router that I hardly use then I have 2 extra Sim cards the problem I have Sim 3 balance is not correct I normally get 2g and sms and calls I have never use any of the sms and calls and for some reason this month I did not get them on top of the 2g I normally buy for R10 the 1g my balance reflects less than 1g I have not use it that much I only checked whatsapp messages I try to contact rain no one is assisting me