I am accumulating ice inside my freezer

Obviously that freezer is not achieved the required temperature. There are several reasons for that:
- Defrosting system is not working, which leads to accumulation too much ice on the evaporator that prevents heat transfer and reduces air circulation despite the fan is running.
- The problem with draining condensate after defrosting cycle which also leads to accumulation of ice.
- Leaking gas from the cooling system (reduced cooling capacity)
- Faulty compressor

Dado

There is water accumulation at the bottom under the basket it forms a thick piece of Ice that we have to break in order to remove it every second day what can I do ..

Most likely cause is a door being left ajar or gaskets not seating. If the ice looks like snow, that is your issue.

Things you can do to cut down on frost.
1.make sure all seals fit flush to frame.
2.use a thermometer and set freezer to -18c(beef will keep upto 12months).
3.wrap all food as airtight as poss.
3.do not overfill,leave space for air flow through drawers/shelves.
4.defrost every 2/3 months in humid conditions using clorine bleach to clean interior,and dry thoroughly.(leave door open to dissipate clorine gas.)

your freezer is leaking freon you need a new freezer

It soungs like you may have compressor going bad or a freon leak. Being a 1970 it would not be cost effective to repair.

remove the back panel of the freezer and see if the evaporator is a block of ice (evaporator is something kind of like a radiator) if is a block of ice replace the defrost thermostat ( a little sensor whit tow wires)
and the defrost timer ( usually next to the refrigerator thermostat inside the fridge side)

you can find this parts at your local appliance part store or online here is a link good luck

the reason there is no fan on the outside is because the outer shell of the unit is the condenser. the unit does it have a fan on the inside? also how does that gfasaket on the outside of the door look like? let me lknow

check your door seal, by closing the door on a strip of newspaper all round the seal. this fault is usually air getting inside the freezer, it rises to the top making thick ice or snow.

you have a cloged evap. drain. the rf is defrosting properly but with the drain be clogged the water has to go somewhere which is generally in the crisper draws on top and bottom models. two way to clear up this issue. turn rf OFF for at least 48 to 72 hrs. to allow the drain to de-ice or take matters into your own hands and take the back panel off of the freezer and using boiling hot water pour it down the evap. drain tube until it flows like you just flushed a tiolet

If you need further help, reach me via phone at https://www.6ya.com/expert/marlon_56d9a24f02585258