Inconsistent with Data Top up

I have signed for 40G contract and within that 40G i share 15g and i am supposed to be given 25G. Instead i am being given 20g and when I asked where is 5g no body can explain. I have spoken to more than 4 managers and some are now avoiding me. This issue started 17Sep and it was resolved 5Nov20 when i was reimbursed my 5G. Come 17Dec20 same thing happened and i called and till today i havent been assisted with returning my data. Managers like Jossica and Charlien are now avoiding me. Every time i call knew ref number is assigned and with the motto of it takes 3days to resolve. What is the meaning of having a contract