My DS is 11 months, and his dad now see's him 2-3 hours a fortnight after more sporadic contact before. At 7 months he started paying £100 maintainance a month, after saying he couldn't afford the £180 the CSA calculator said he should be paying. He agreed that after 2 months he would raise it to £150. This still hasn't happened, but I don't know how to bring it up without sounding really "grabby". He has already made comments about "not needing that much money." and told me to put all the left over money in DS's account not "keep it for myself", and asked for he account details to make sure there was enough going in each month.
How can I ask him to raise it like we agreed without him getting confrontational? Any advice of what to say to keep it calm but get results would be helpful.