What more must I do

Last month I paid you on the same date I always do. Because of the strike (according to call center) the payment wasn't allocated to my account on your side.<br> <br> I sent proof of payment to the agent, and my account wasn't suspended.<br> <br> Today I get my new statement for this month, and last months payment is still listed as outstanding.<br> <br> What the hell guys. Fix my account! This shouldn't be difficult.