Capitec APP incorrect pin??

I'm really so fed up with Capitec Bank APP. Unfortunately it is the only way one can do transactions nowadays which is a HUGE problem when I am not living in the city & the closest branch is a 90km roundtrip costing me money in petrol & time. Lately I'm unable to log into my online banking as according to the APP I've entered an INCORRECT pin! After a while it seems as whatever the problem might be, I can then access my account even when entering the so-called incorrect pin again. Really Capitec??? Is this the way to go? How do I explain to Suppliers that I am unable to pay them? Please advise.