Guaranteed Rental agency – Can’t get my property back after 3 years

Back in 2013, we signed a contract with a Guaranteed Rental letting agency for a 3 year period. The contract stated that if/when we wanted our property back (after the 3yr period) we would give 2 months notice, but the actual time taken to return vacant possession could be delayed due to eviction proceedings etc.

We don’t have a direct tenancy agreement etc with the tenant – that is between the agency and the tenant. I suppose we just have a ‘business contract’ with the agency.

We have been trying to get our property back for over 3 and a half years – having given notice back in October 2018.

However, the agency has not returned the property to us. We repeatedly ring, write, and email the agency and just keep hearing excuses and promises, but nothing seems to have happened.

They claim to have issued a Section 21 notice to the tenant on two occasions and even provided us with scans of this document, but this has not brought us any closer to getting our property back. As far as we can tell, they have never taken the tenant to court, etc – not provided any evidence – nor have they ever claimed the delays are due to court action.

The only positive is that they continue to pay the rent on time every month.

I am wondering what our legal options are here? can we sue them for breach of contract? Would that even help get our property back?

If we did take them to court, could the court force them to bring eviction proceedings against their tenants?

Many Thanks

UN