Fnb sticking up for mweb who are non existent

I have a problem with mweb who are no longer honouring customers best wishes and payments - i am told to get in touch with mweb and send proof to fnb about this, pray tell me how i am supposed to do this if i spent R150 on airtime TRYING to get hold of first accounts (no response) sales (no response) technical (no response) tried again accounts, sales no response. Got a response from tech who said they transfer me to accounts no response again. Tried chat no response half a dozen times - got a response and then was told i owe them for the coming month (May) I paid in on the 26th April my account was suspended for owing them 59 rand they would not admit to recieving the amount i paid on the 25th of April and suspended my account. I never used their service at all in May and i have been asking fnb to refund that as i am now using another service provider. I got one email from fnb asking for details of the transaction which i provided and was asked for proof of correspondence with Mweb which was non existent. JUst look on facebook mweb bad service and see all the hundreds of people who have had same problem. Please sort this out so unfair.