Impossible to pay outstanding R8.38 on account from years ago so cant sign up new contract.

Tried to sign up for a new sim-only contract. Couldn't because of a past contract where after it was cancelled there was according to them late usage. This cost was R8.38. The payment details given didn't work. Easypay say account doesnt exist. When I enter the bank account on online banking...it is not accepted. Because of this, the contract is refused. This company is completely *********** when it come to anything billing related. I am silly for even trying to sign up.