Deliberately putting my accounts in arrears

I have policies with Old Mutual. Ever since I took up these policies I have been getting calls every month from their call centre for arrangements to debit my account. But now I have had enough of these calls because they still not doing their job. In December 2015 they sent me an sms this time around for an arrangement for payment, in return I called them to make the arrangement for the 15th of December. On the 21st I got an sms saying that my premiums are unpaid as I failed to make payment for the 15th. I again called them to find out why am I in arrears yet I made an arrangement, as usual I could not get a straight answer from the consulted I spoke to. Again I made another arrangement for 27th and still no debit order went through. Today I received another sms about unpaid premiums despite the couple of times I have been arranging with them. <br> I am so upset and so disappointed at the level of service that Old Mutual has given me. My credit score will be badly affected because I will be seen as a slow payer. This experience has made me think they doing this on purpose in order for my accounts to laps so they can gain from my lose. Old Mutual does not value their clients.