This is my problem solving question that I very much struggling with. I am particularly confused as to why Giorgio claims that Maria and James owe him an outstanding 500? I am not sure why. Please help, with this question.

Thank you.

(The question is below)

In May 2018 Maria and James, who are deeply in love, decided to marry. The wedding date was set for 3^rdAugust 2019.

In preparation for the wedding, they bought a wedding dress for Mariafor 9,000from the Italian designer Giorgio. It was agreed that they would pay for the dress inmonthly instalments of 150over a period of five years.The payments were due on thefirst of each month, with the first payment due on1^stJuly 2018. On 3^rdOctober 2018, Maria and James contacted Giorgio.Claiming that they were in severe financial difficulties, they asked him to reduce the remaininginstalments to 100 per month,without extension of the overall payment period of five years. Giorgio, who believed that the couple were trying their best, agreed with their proposal. On 20^thJanuary 2019, Jamesreceived a large legacyunder his aunt's will.He did not inform Giorgio.

In February 2019, James and Maria started their search for a wedding venue. First, they decided in favour of a rustic theme in the woods. They made a contract with Amazing Tents Ltd., who, for a price of 3000, promised to hire them a wedding tent for about 100 guests. The contract stipulated that the wedding tent should be available by 19^thJuly 2019, but Amazing Tents only managed to provide it by 25^thJuly.Meanwhile, James and Maria had checked the weather forecast, which indicated that it might rain on their wedding day. They informed Amazing Tents that they wished to terminate their contract. Instead, they used the 3000 to book an indoor venue.

It is now 31^stAugust 2019, and Maria and James have married and returned from honeymoon. They ask for your advice on the following issues:

a)Giorgio is now demanding that Maria and James must pay the future instalments of 150 per month with immediate effect. He also claims that Maria and James still owe him outstanding payments to the amount of 500.

b)Amazing Tents demand that Maria and James must pay them 3000 for the provision of the wedding tent.

Advise Maria and James.