Good Day

I require legal advice as how to handle the situation legally. 

I am a Functional Gym owner and work with contract options, every client signs a contract and terms and conditions upon joining. 

One client (our town's local rugby club) has taken a 6 month contract starting as of February till end July 2020. 

I had verbally spoken to one of their management members before lockdown about freezing their contract for the month of May as payement still needs to be made for April due to fixed payments and I need to make arrangements accordingly.

According to my terms and conditions I am only allowed to freeze a contract due to physical disability or illness, temporary relocation or extended travel, military deployment. I have sent out a "Freeze Form", seeing as the virus is a pandemic and could fall under 'illness', before the lockdown for the month of May but received no feedback. 

Payment was overdue and I contacted management enquiring if all was in order for Aprils' payment. 

Basically, he said due to the coronavirus and lockdown they will not pay for April, saying rather rudely "no services, no payment".

Unfortunately I still have fixed expenses. I am a small business, with very little income and am now in debt due to the client not paying. I also have a 2 year old child that needs essentials. 

This contract is a large chunk of my profit, should I handle this incorrectly I could lose their future services, should I not handle it at all would they disregard my terms and I feel disrespected.