Updating Plan count in subscription

Im running automation where we want to to increment the quantity of a customers subscription plan by 1. Ive been testing with different update bodies but even though I get the "successfully updated" message on calling the update method, the quantity does not increase.

See code below for an example:

subscriptionURL = "https://subscriptions.zoho.com/api/v1/subscriptions/" + foundSubscriptionID;

info foundSubscriptionID;

getSubscriptionResponse = invokeurl

[

url :subscriptionURL

type :GET

connection:"subscriptions_connection"

];

subscription = getSubscriptionResponse.get("subscription");

plan = subscription.get("plan");

planTotal = plan.get("total");

planTotalDouble = planTotal.toDecimal();

planPrice = plan.get("price");

planPriceDecimal = planPrice.toDecimal();

// Update the total amount

planTotalDouble = planTotalDouble + planPriceDecimal;

plan.put("total", planTotalDouble);

planQuantity = plan.get("quantity");

planQuantityNumber = planQuantity.toNumber();

planQuantityNumber = planQuantityNumber + 1;

//replace quantity of old plan with new plan;

plan.put("quantity",planQuantityNumber);

subscription.put("plan",plan);

info plan;

updateSubscriptionResponse =zoho.subscriptions.update("subscriptions",organizationID,foundSubscriptionID,subscription,"subscriptions_connection");

Another version I tried using just quantity:
otherUpdateBody = {"quantity":planQuantityNumber};

updateSubscriptionResponse = zoho.subscriptions.update("subscriptions",organizationID,foundSubscriptionID,otherUpdateBody,"subscriptions_connection");

What would be the best way to update a plans quantity in a subscription from deluge?

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