Bad attitude and disgusting service

I inadvertently entered a pre-paid voucher in the old manner and received data instead of airtime - I contacted the call center, per the call center I am not allowed to make an error - I wanted them to convert the data back to call time. The person from the call center insisted that I am the one that made the error, kept on interrupting me and was totally not even prepared to assist me. What a pity this website has requested no abusive language as the descriptive terms I can think of is unfortunately deemed such. This company should be bought up short and I can only think of changing service providers. The problem is who does one deal with as the service providers all appear tarred with the same brush. This company does not even deserve one star.