It is unnecessary to use your lawyer. The legal fee can be higher than your outstanding amount of rent.
Below is from my book
No B.S. Guide to Property Investment. Hope it helps.
Be upfront with tenants on the penalty
Specify in every tenancy agreement that, if the rent remains unpaid for seven days, the tenant shall pay to the landlord an interest of 12 percent per annum. The interest is to be computed daily from the original due date until the date the landlord receives the outstanding payment.
If you don’t receive any rent on the due date, allow a grace period of five days before you send your tenant the first reminder. Remind your tenant about the interest charged on any late payment.
How to evict bad tenants
After sending the ultimatum, it is legal to end the tenancy and for the landlord to re-enter the property. The landlord can liaise with the property agent to do a lock-out when the tenant is away.
The tenant can arrange with the property agent to collect personal belongings after clearing all outstanding payments.