Internet being cut-off and payments not in account

For the past 3 months there have been issues of my payments not reflecting on my account statement. Each month I would recieve several phone calls that I am in arrears. I have had to phone in 2 months in a row now to assist them in finding my payments and allocating it to my account when I have been cut off. Each month when I make payment, the refernce is my account number and proof of the transfer is automatically sent through to the accounts department. Since 8th April I have been in contact with them about my account. Turns out they didnt even have my payment for January in my account. I then requested my statements to be corrected, only to find again that they were still wrong as it did not reflect my March 30th payment, I then requested it to be corrected again and warned that I not have my internet cut off. Low and behold I was cutoff again(Thursday-Monday)which has put me behind in my work. I contact someone to reconnect me, and sent an email again. both emails have passed there 3 day period of getting back to me and I had another lady contact me that I am in arrears. How many more times must I sent POP through and get corrected statements. I feel like I have to do there job