Surely it can't be THAT difficult

Jan 2015- Phoned both Credit Card & Chq Account Departments to change statement dates<br> Feb 2015- Credit card statement date changed (successful 1st time round.)<br> 18 Feb 2015- Chq statement date NOT changed,still got it on the 18th, told it would be done for end March.<br> 18 Mar 2015- Got Chq statement<br> 23 Mar 2015- Got told it would happen at end April only,since statement already issued on 18th.<br> 12 Apr 2015- Phoned before 18th to make sure to get statement only at the end of April 2015, told yes.<br> 18 Apr 2015- Got statement (third month incorrect date)<br> 10 May 2015- Phone again to ensure statement date only on at the end of the month. <br> 18 May 2015- Got statement (fourth Month incorrect statement cycle)<br> 27 May 2015- This time request ref no for call RR*** & lodge complaint RB***. Told it would be handled, told to phone back Friday 29 May.<br> 29 May 2015- Phone at 10h40, still not rectified, I say I want statement at end of THIS month even though already got one on 18th. Complaint sent to IT department RB***<br> 29 May 2015, phone at 16h40 since no feedback as promised, RX***. Told will be done next month definitely, I've heard same story for past 5 months...