Depending on the amount of debt and number of creditors you have, it may be possible for you to directly contact your creditors and negotiate a lower interest rate or a repayment schedule that works for you.
With informal proposals, each of your creditors will expect you to present them with a plan outlining how you can pay them back. You may also be required to submit a sworn statutory declaration outlining all of your assets, debts and income. Each creditor will negotiate with you separately, as their goal is to obtain the money that is owed to them. Explain your financial situation honestly and submit a realistic proposal with a reasonable payment schedule. Be aware, the longer the repayment term, the more interest you will be paying.
Creditors are not required, nor have any legal obligation, to arrange alternative payment terms with you. Furthermore, the creditor may be entitled to end special arrangements at any time with little to no notification. Also, this option may not stop collections agencies from calling. The more creditors you have, the more difficult it becomes to arrange an informal arrangement with each one.