Hello. We are having some issues with our pourd concrete foundation. Our house has a concrete slab porch (about 5ft by 24ft) on the front that comes out at the top of the front foundation wall. about 2 years ago the front of porch dropped about an inch. This caused the foudation to crack right in the corner where the side and front foundation meet. At the top the crack was about an inch wide and tappers down to the floor of the basement were it is a couple milimeteres. Porch sank because the downspout went into the ground right beside it. We rerounted the down spout away from the house and had the foundation injected to seal the leak. The intereior walls were left for a year to see if it would leak then I spray foamed to fiish the basement again.Now a year later it's leaking again. We've had a couple companies come in and they seem to be going about things a little differently. All of them want to dig up the exterior and around the porch, then under pin to stablize the pourch. After that they differ. One want to only fill the crack with concrete grout then water proof the wall and backfill. The other want to reiforce the wall by bolting flat steel bars wrapping around the corner as well as filling the cack and waterproofing. The last company wants to cut the corner out about a foot on each wall,then using rebar to to tie into each and repour the corner, followed by waterproofing and then back fill. The first 2 companies are pretty close in price at between 13-15 thousand. The last company wants just under 20. I've pretty much rulled out the fist company as i think the walls need some kind of reinforcing. My question is, is bolting steel plates around the corner enough or does the corner need to be replaced?