Poor customer service resulted in cut line

I went to pay my account in store as I do every month and this is now the second time it happened there is a queue of customers and the staff in store just doesn't care they will chat with colleagues and on there phones. Ignoring the customers completely eventually after 30min of waiting and then making a scene the staff member helped me but my card was declined twice, sabotaged by that staff member as there was money in my account and resulted in my line cut because of lack of interest in there customers from telkoms side this is completely unacceptable as I was in store to pay my account before it got cut! If telkom can not help there customers instore how can they cut a persons line without notification and a specially someone that went instore to pay there account. There staff have bad attitudes and the lack of interest in there customers!! I want my line reinstated asap!