I have written an informal letter about 3 months ago regarding the issue and I have now raised a formal grievance but not heard anything back
I have also started an early conciliation with ACAS.
At a risk of outing myself the company is a charity and a lot of its processes are well out of sync with other companies I have worked for. The process for overtime is long winded and unnecessarily complicated. It goes to one store manager who collates it, then to another store manager who inputs it, then to the area manager who authorises it and finally to payroll who process it. However if one person in that chain is on holiday then it doesn't get done until they return which is ridiculous!
Overtime is generally 4 weeks in arrears which is something i am used to but sometimes it can be 6 or 8 weeks.
My argument is really that they were all informed on April payday that monies were missing, they all agreed it as missing and that it would be processed but then it didn't get processed until nearly a month later meaning that it then missed the may cut off point!
If this had been a one off I could have excused it as human error but its not last year over the course of 5 months they underpaid my overtime but almost £500 which i then had to prove I had worked. Then I had to wait 2 months for them to correct their error!!
Any how I have given them until Friday, which will be 2 weeks since i originally raised the issue, to correct this, thus meaning I will return to work Sunday and still work my contracted hours for this week but I have informed them i will not be working any more overtime for the company in the future.