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Need some patch work and the part of the roof water proofed

Hi, Need a free quote for a roof repair. From a few months I have seen swelling of a part of my house where I saw water dripping a little and swelling and this morning when I tried removing a cob web the mdf bit fell apart possibly due to water damage. It looks like a minor work of sealing the roof if any entry of water through screws or gaps in the iron roof. Need inspection and fix to ensure this does not happen. May I please get a quote on this as I am running on a very tight budget.