Centurylink Inc. Centurylink Business keeps crediting the wrong account and sending me shut off notices Monroe Louisiana

On January 23, 2018 I ordered my business service and was give an estimate of $89.00 plus taxes and fees. I receive my first bill for 168.77 and sent my payment on February 1, 2018, My bank shows the check cashed on February 6, 2018. I received my first shutoff notice on March 2, 2018.    I received my second bill for 237.62 on February 25, 2018. I paid the bill on March 1, 2018. My bank shows the check cashed on March 6, 2018. I am staring at another delinquint account notice. I am calling the billing number and wasting more business time on Centurylink Small Business Service (AN OXYMORON!!!).